FD/CFD Controller Instruction Manual Conveyor Tracking: 3rd Edition
FD/CFD Controller Instruction Manual Conveyor Tracking: 3rd Edition
FD/CFD CONTROLLER
 INSTRUCTION MANUAL
  CONVEYOR TRACKING
3rd edition
・Before attempting to operate the robot, please read through this operating manual
 carefully, and comply with all the safety-related items and instructions in the text.
・The installation, operation and maintenance of this robot should be undertaken only
 by those individuals who have attended one of our robot course.
・When using this robot, observe the low related with industrial robot and with
 safety issues in each country.
・This operating manual must be given without fail to the individual who will be actually
 operating the robot.
・Please direct any queries about parts of this operating manual which may not be
 completely clear or any inquiries concerning the after-sale service of this robot to any
 of the service centers listed on the back cover.
                                                                                                                                        Table of contents
Table of Contents
Chapter3 Teaching
       3.1 Teaching Flow............................................................................................................................ 3-1
                                                                                                                                                             1
Table of contents
Chapter5 Playback
            5.1 Playback .................................................................................................................................... 5-1
               5.1.1 Normal ............................................................................................................................... 5-1
               5.1.2 Simulation .......................................................................................................................... 5-2
               5.1.3 Test .................................................................................................................................... 5-2
Chapter6 Troubleshoot
            6.1 List of error codes ...................................................................................................................... 6-1
               6.1.1 Error................................................................................................................................... 6-1
               6.1.2 Alarm.................................................................................................................................. 6-2
               6.1.3 Information......................................................................................................................... 6-2
2
                                                                                                       1.1   Outline
        It is now assumed that the teaching shown in figure (a) below has been performed when the conveyor is
       at a standstill. If what has been taught is played back while the conveyor is moving, the robot will move
       along the path shown in figure (b) below. When viewed from the perspective of the work personnel, the
       movements appear as shown in figure (b) below, but when viewed from a point on the conveyor, they
       appear as shown in figure (a).
                                This refers to the memory in which are stored the values obtained by converting
                                the pulse values from the pulse generator into distances (measured in
                                millimeters or degrees). In order for the position of the conveyor at the teaching
     Conveyor register
                                stage to be recorded, the values in this register are recorded as part of the
                                teaching data.
                                This is a mechanical limit switch which detects the work on the conveyor and
                                serves as the conveyor synchronization start reference. When it is actuated, the
     Start LS
                                pulse signals from the pulse generator are counted.
                                                                                                                1-1
1.1   Outline
                               In this mode, even if the conveyor is not actually operated, the robot
                               operates in synchronization with the conveyor speed specified in
                               response to the manual input of the conveyor speed. By using
                               machine lock as well, the software stroke and cycle time can be          The register is
                Simulation
                               checked without operating the                                            reset at step 0.
                               conveyor and robot. In the Simulation mode, an error results when
                               the conveyor operation underway signal is input, and the robot stops.
                   There are 4 ways to select the conveyor synchronization mode. (       “1.5 How to select the conveyor
                  mode”)
1-2
                                                                                    1.2   Basic conveyor settings
 1.2.1 Initialization
         Prior to use the conveyor tracking utility, conveyor mechanism must be registered.
                                                                                                             1-3
12    Basic conveyor settings
IMPORTANT
Example of multi-unit
                                 6      Press F12<Complete>.
                                        >> Following confirmation message appears.
1-4
                                                                               1.2   Basic conveyor settings
IMPORTANT        - When traverse unit is used, traverse unit mechanism must be fixed on the “GROUND”,
                    and robot mechanism must be fixed on the traverse unit.
            8      Select the basic mechanism for each mechanism. and press F12<Complete>.
                   >> Following confirmation message appears.
                                                                                                         1-5
12    Basic conveyor settings
                                     When two or more conveyors are to be used, needed conveyor can be selected by
                                     pressing <Page scroll> keys.
                                4    Align the cursor with the desired position, input the numerical values, and
                                     press the [Enter] key.
5 Upon completion of all the settings, press the f12 <Complete> key.
1-6
                                                                               1.2    Basic conveyor settings
                                    Conveyor setting
                      Factory       Input
     Parameter                                                   Description of function
                      settings     range
Pulse constant           0        -10000      This parameter is used to set the relationship between the
                                     to       pulse generator mounted on the conveyor and the machine.
                                  100000      Set the number of conveyor pulses to be output when the
                                 [pulse/m]    conveyor moves by 1 m or 1 inch (depends on defined unit)
                                              in the case of linear conveyor, or by 1 degree in the case of
                                              circular conveyor.
                                              Since the pulses which are output from the pulse generator
                                              are multiplied by 4 inside the control unit, the pulse count is
                                              calculated by multiplying it by 4.
                                              Robot controller can count up to 67,108,860 conveyor pulse
                                              (this value is after multiplied by 4).
Installed angle       Directly     Directly   This parameter is used to define the position of conveyor.
                       input        Input     Two ways, inputting direct values or referring user
                                      ・       coordinate system, are permitted.
                                    User
                                   Coord.     Directly input: Using the world coordinate system as the
                                              reference, the parameter is used to set the home position
                                              and inclination angle of the conveyor as numerical values.
                                              User Cord.: The conveyor coordinate system is registered
                                              as a user coordinate system ahead of time, and the number
                                              of this user coordinate system is used to specify the
                                              parameter.
User coordinate No.      0          1 to      The conveyor coordinate system can be defined as the user
                                    100       coordinate system, and its number is registered here.
                                              The installation position of the conveyor is not modified
                                              even if the user coordinate system has been changed after
                                              the conveyor installation has been registered.
X Vector Coordinate      0        -10000      When a circular conveyor is used, this parameter is used to
Y Vector Coordinate                  to       specify the home position of the conveyor as referenced to
Z Vector Coordinate                10000      the world coordinate system. There is no need to set this for
                                  [mm]        linear conveyor. Register the coordinate value based on the
                                              world coordinate system, in case both set with user
                                              coordinate system and set with numeric.
                                                                                                          1-7
12    Basic conveyor settings
                Conveyor type             -        Circle     This parameter is used to specify the conveyor shape.
                                                     ・        This can be changed from initialized setting. But if this is
                                                   Linear     changed after teaching is completed, robot locus may
                                                              change. This setting must be completed before starting the
                                                              teaching procedure.
                                                              Circle : Conveyor shape is circle.
                                                              Linear : Conveyor shape. Is linear.
                                    When two or more conveyors are to be used, needed conveyor can be selected by
                                    pressing <Page scroll> keys.
                                2   Align the cursor with the desired position, input the numerical values, and
                                    press the [Enter] key.
                                3   Upon completion of the settings, press the [Complete] key. The settings are
                                    now saved in the constant file.
                                    >>The operations of the robot can be limited then and there using the setting data.
1-8
                                                                                    1.2   Basic conveyor settings
                          When two or more conveyors are to be used, needed conveyor can be selected by
                          pressing <Page scroll> keys.
                    2     Align the cursor with the desired position, input the numerical values, and
                          press the [Enter] key.
                    3     Upon completion of all the settings, press the f12 [Complete] key.
                          >>The operations of the robot can be limited then and there using the setting data.
                                                                                                                1-9
12     Basic conveyor settings
1-10
                                                                                     1.2   Basic conveyor settings
                         When two or more conveyors are to be used, needed conveyor can be selected by
                         pressing <Page scroll> keys.
                     2   Align the cursor with the desired position, input the numerical values, and
                         press the [Enter] key.
                     3   Upon completion of all the settings, press the f12 <Complete> key.
                         >>The operations of the robot can be limited then and there using the setting data.
                                                                                                               1-11
1.3 Allocating the conveyor synchronization input/output signals
                                Table 1.8   Relation between conveyor mode and conveyor running signal
                               Mode
                                                Conv.normal                   Conv.test               Conv.simulation
                 setting
                                               ON: running
               Pause                                                             ON                          ON
                                              OFF : hold/stop
                                               ON: running
               Alarm                                                             ON                          ON
                                               OFF : stop
               Ignore                             ON/OFF                      ON/OFF                      ON/OFF
1-12
                                                  1.3 Allocating the conveyor synchronization input/output signals
      Conv.normal                     0
                                                 These signals output the playback mode status of conveyor
      Conv.simulation                 0
                                                 synchronization.
      Conv.test                       0
    These soft keys are needed to be allocated by customer. Please refer to “Instruction Manual Basic
   Operation”, ”Chapter 7 Useful functions” “7.8.1 Changing the soft key allocation” for the detail operation.
                                                                                                            1-13
1.5 How to select the conveyor mode
2 Align cursor with [22 Conveyor mode] menu and press [Enter] key.
2 Pres [↑] [↓] keys to choose the desired mode and press [Enter] key.
2 Select the mode using the number key (0 to 3), and press [Enter].
Numeric
1-14
                                                                                      2.1 Needed Parts (FD controller)
          Other equipments and works needed for conveyor tracking system (Prepared by customer)
            Equipment pr Work          Manufacturer                          Type or so
    I/O board                            NACHI       This is DC24V I/O board to connect Start LS and or
                                                     so. This is installed inside robot controller cabinet.
                                                     FD11-OP125-#
                                                     (#=A : 32 points, B :64 points )
    Conveyor Sync. Transmission Unit       NACHI          This is a unit to read conveyor pulse sent from Pulse
    (PTU)                                                 Generator (prepared by customer) and send it to
                                                          robot controller.
                                                          Type; AW10-OP47-A
    Connecting    cables    between         (any)         Connecting cables between all above equipments
    equipments and those work                             and those work
                                               Power
                                               source       AC100V/200V
       CFD controller
                           Twisted pair                           Accessory cable
                           shield wire                           of pulse generator
           Conveyor
           Tracking                                 PTU
         Receiving Unit
                                                                                                         To
                                                                             Pulse generator             conveyor
                                              Conveyor Sync.
                                             Transmission Unit
                                                                                 Start LS
          I/O board
                                                                                                   Conveyor motor
                                                                                                   controller    or
                                                                                 Conveyor          magnet switch
                                                                                 running signal
                                Prepared by customer
System diagram
                                                                                                                    2-1
2.1 Needed Parts (FD controller)
                                                                              260
                                                                              244
                     Conveyor Tracking Transmission Unit          8                                  8
                                   (PTU)                                      220
                               220
                                               120                                                 4-φ5.2 Thru hole
                                                                 20
                                                     230
230
                                                                 190
                                   1-φ16 Thru hole
                                   2-φ22 Thru hole
                                                                 20
                                      Conveyor Tracking Transmission Unit PTU (Type AW10-OP47-A)
2-2
                                                       Conveyor          Conveyor
                                                       synchronization   synchronization
                                                       receive board     receive board
                                                                                                        Terminal block    Terminal block
                                                                                                                                                                                                       Accessory cable of
                                                                                                                                                                                                       pulse generator
                                                                                                                   Connected
                                                                                                                   inside terminal
Power unit
Piping prepared by
                                                                                                                                                                                                                 Conveyor start LS
                                                                                                                                           Start trigger
                                                                                                                                           input signal
                                                                    ↑
                                                                                                                                       Conveyor running
                                                               FD11-OP47-A                                                             input signal
                                                                                                                                                                                                                 Conveyor motor
                                                                                                                                                                                Prepared by customer             controller or
                                                                                                                                                                                                                 magnet switch
2-3
                                                                                                                                                                                                                                     2.1 Needed Parts (FD controller)
2-4
                                                       Conveyor          Conveyor
                                                       synchronization   synchronization
                                                       receive board     receive board
                                                                                                                                                                                                     2.1 Needed Parts (FD controller)
                                                                                                                     Connected
                                                                                                                     inside terminal
Power unit
                                                               ↑                                                                                                                 Conveyor motor
                                                                                                                                                                                 controller or
                                                          FD11-OP47-A                                                                     Conveyor running                       magnet switch
                                                                                                                                          input signal
                                                                                                                                                          Prepared by customer
                                                                                      2.1 Needed Parts (FD controller)
    Wires (Accessory cable of pulse generator) from the pulse generator mounted on the conveyor must be
   connected to the terminals of the Transmission unit (PTU).
    Wires (twisted pair shield cable) from the Transmission unit (PTU) must be connected to the terminals
   (TBCV) of controller.
                     Do not bind the power and signal cables together, and run through separate tubes
                     (such as steel or flexible tubes).
       IMPORTANT
■ “Start LS” and “Conveyor running” input signal -> “Robot controller DC24V I/O board”
   Connect the signal from the start LS mounted on the conveyor unit to the pin allocated to “start LS” on the
 input signal connector in robot controller.
   Connect the signal from conveyor motor control panel or electromagnetic switch to the pin allocated to
 “conveyor running” on the input signal connector in robot controller.
   Please refer to “Instruction Manual SETUP”, ”Chapter 3 Connection” for the electric specification of DC24V
 input circuit.
                                                                                        Second conveyor
                                                Added
                                               Conveyor
                                            synchronization          Conveyor
                                             receiving unit       synchronization
                                                                 transmission unit
                                             (Board ID=1)
                                                                                     Pulse generator
                                                                                                          All ON (fixed)
          SW3      Channel 3             Not used
                   Termination
                   resistor
                                                                                                          All ON (fixed)
          SW4      Channel 2             Not used
                   Termination
                   resistor
All ON (fixed)
                                                                                                                      2-5
2.1 Needed Parts (FD controller)
                                                                                  Conveyor          Conveyor
                                                                               synchronization   synchronization
                       SW6         Channel 0              With termination
                                                              register
                                                                                receiving unit   transmission unit
resistor
                                                                                                                                             All ON
                                                                                  Conveyor          Conveyor
                                                           No termination
                                                                               synchronization
                                                                                receiving unit
                                                                                                 synchronization                       (with Termination
                                                              register                           transmission unit
                                                            (switch OFF)        (Board ID=0)                         Pulse generator
                                                                                                                                           register )
Robot controller
                                                                                  Conveyor
                                                          With termination
                                                                               synchronization
                                                              register          receiving unit
                                                           (switch ON)
                                                                                (Board ID=0)
2-6
                                                                                            3.1 Teaching Flow
Chapter3 Teaching
3.1 Teaching Flow
   Proceed with teaching by following the steps below.
                                                                                                            3-1
3.2 Recording conveyor synchronization step
1 Use the [Axis operation keys] to move the robot to the recorded step.
                           2    Press <Conveyor ON/OFF> key to turn the conveyor synchronization step to ON.
                                >>Now “C*” mark is displayed on the record status area. * is conveyor number.
                           3    Press [O.WRITE/REC].
                                >>The conveyor synchronization step is now recorded.
                                When this step is recorded, the current conveyor position is recorded in the conveyor
                                register, and the conveyor register value at that time appears inside the square brackets
                                ([ ]).
3-2
                                                                                3.3 Recording function commands
                                                                                                              3-3
3.3 Recording function commands
3-4
                                                                             3.4 Modifying the teaching contents
POINT In the step, conveyor register is recorded as the position data of conveyor mechanism.
                      3   To change the value in the recorded conveyor register at the desired step,
                          align the cursor with the conveyor register, and input the conveyor register in
                          the “Input” field and press [Enter].
Numeric ->
                      4   To reflect the changes, press [Complete] or press the [EDIT] key again.
                          (To exit without reflecting the change, press the [Reset/R] key or [Cancel] key.)
        or
                                                                                                               3-5
3.4 Modifying the teaching contents
3-6
                                                                                  3.5 Check Go / Check Back
                   In order to check the conveyor synchronization program by check go / check back, conveyor
                   mode must be set to the “Simulation”.
      IMPORTANT    Correct motion can not be performed under “Normal” and “Test” mode.
       (1) at the point when changing from the no-synchronization step to the synchronization step
       (2) at the point when previous conveyor register value and next conveyor register value is different
                                                                                                              3-7
3.5 Check Go / Check Back
                             Conveyor register changing and confirmation message is displayed only when conveyor
                             mode is “Simulation”. Therefore before proceeding check go / check back, please never
               IMPORTANT     forget to confirm that conveyor mode is “Simulation”.
or
                            2   To change the conveyor register value, select “yes” with right/left key and
                                press [Enter].
                                >> Following screen appears to entry the conveyor register value.
                                >> If “no” is selected, conveyor register value does not change.
                            4   Proceed the check go and check back, then robot moves to point according to
                     +          the new conveyor register value.
                                >> If “no” is selected, conveyor register value does not change. So robot moves to the
                                   point according to the previous conveyor register value.
or
3-8
                                                                                  3.5 Check Go / Check Back
or
                    2    To change the conveyor register value, select “yes” with right/left key and
                         press [Enter].
                         >> Following screen appears to entry the conveyor register value.
                         >> If “no” is selected, conveyor register value does not change.
                    4    Proceed the check go and check back, then robot moves to point according to
             +           the new conveyor register value.
                         >> If “no” is selected, conveyor register value does not change. So robot moves to the
                            point according to the previous conveyor register value.
or
                                                                                                             3-9
3.5 Check Go / Check Back
NOTE
3-10
                                                                             4.1 Conveyor monitor displays
Among the 4 monitor displays available, the example below uses the second monitor screen (monitor 2).
                  2     Align the cursor with “40 Conveyor Monitor”, and press [Enter].
                        >>The conveyor monitor data is displayed on monitor 2.
                                                                                                           4-1
4.2 Changing the conveyor register values
POINT Numerical values can be input only in the conveyor simulation mode.
                              2    Move the cursor to the desired edit box, input the data, and press the [Enter]
                                   key.
                                   >>The display changes, but the data has not been updated at this point in time.
        Numeric→
                              3    Upon completion of the editing, press the f12 <Complete> key.
                                   >>The data is updated, and the original display screen is restored.
4-2
                                                                             4.3 Resetting the conveyor counter
POINT When the conveyor counter is reset, the “Conveyor counter reset” signal is output.
                                                                                                               4-3
4.4 Shortcut (R code)
                         Shortcut                                              Description
                  R40                      Set conveyor register
                         Shortcut                                              Description
                  R44                      Conveyor counter reset
                         Shortcut                                              Description
                  R224                     Select conveyor mode
              r
                       Parameter                                        Description, setting range
                  Conveyor mode            0: Normal    1: Simulation    2: Test
                         Shortcut                                              Description
                  R363                     Set conveyor speed
                         Shortcut                                              Description
                  R364                     Select conveyor No.
4-4
                                                                                                     5.1 Playback
Chapter5 Playback
5.1 Playback
                         If robot detects some error and stops, the system logic has to be made to stop the
                         conveyor also.
          CAUTION
                       Do not turn off the primary power while the playback of conveyor synchronization.
                       If primary power is turned off while the playback of conveyor synchronization program,
                       position relationship of the conveyor and the robot becomes wrong because pulse can
          CAUTION      not been counted from the pulse generator.
                       Bear in mind that check the absolute position of both conveyor and robot.
                       While the playback of conveyor synchronization, do not stop the robot, select the step
                       and turn off the power of the controller with no reason.
                       When restarting the robot, robot may not follow the conveyor because of the safety
          CAUTION      slow speed playback.
There are three conveyor synchronization modes. Each of these synchronization modes is described below.
 5.1.1 Normal
         In the “Normal” mode, the conveyor is actually operated, and the robot performs the playback while
       tracking the movements of the work.
1 Place the work at a position before the position where the start LS is set to ON.
2 Select the playback mode, and change the conveyor mode to “Normal”.
3 Select the number of the program to be played back, and select step 0.
                        Take care to ensure that the start LS will not be set to ON by the next work before the
                        robot completes the 1-cycle operation. Once the start LS is set to ON, any further
           IMPORTANT    setting to ON will be ignored during the cycle concerned.
                         • Since the operation of the conveyor is not subject to control by robot controller, the
                         synchronization between the robot and conveyor operations will be lost if the speed
          IMPORTANT      of the robot is changed by the speed override function.
                         • After the conveyor register value has been reset in step 0, count-up commences
                         when the start LS signal is input. However, it is not reset at step 0 if that step has
                         been specified by a program call.
                                                                                                               5-1
5.1 Playback
        5.1.2 Simulation
                 In the “Simulation” mode, the robot operates in synchronization with the conveyor by simulating the
               setting of the conveyor speed even when the actual conveyor does not move. This mode makes it possible
               to check the robot operations during playback, the movable area of the robot or the extent of the cycle
               time.
1 Select the playback mode, and change the conveyor mode to “Simulation”.
3 Select the number of the program to be played back, and select step 0.
                                 Beware in mind that robot moves without concerning with the actual conveyor
                                 position in simulation mode..
                  IMPORTANT
        5.1.3 Test
                In the “Test” mode, it is possible to check the movements of the robot vis-à-vis the work without operating
               the conveyor.
1 Select the playback mode, and change the conveyor mode to “Test”.
2 Select the number of the program to be played back, and select step 0.
                                The conveyor register value is not reset when operation is started. Therefore, the robot
                                operates independently of the conveyor position.
                  IMPORTANT
                                 Bear in mind that robot moves suddenly to the unexpected position depending on the
                                 conveyor register value.
                  CAUTION
5-2
                                                                                           6.1 List of error codes
Chapter6 Troubleshoot
6.1 List of error codes
    Listed in the table below are the errors relating to conveyor synchronization.
6.1.1 Error
   Number               59
   Message              Tracking is not possible because the conveyor speed is too high.
   When error
                        During playback
   occurred
                        The robot cannot track the conveyor because the maximum speed set for the conveyor
   Cause
                        speed has been exceeded by a wide margin.
   Countermeasure       Reduce the conveyor speed. Alternatively, check the conveyor pulse detection system.
   Number             270
   Message            The conveyor moved.
   When error
                      During playback
   occurred
                      This error results when “Test” is established as the conveyor synchronization mode
   Cause
                      and the conveyor pulse value has changed by more than 2 pulses/msec.
                      Stop the conveyor, set the conveyor synchronization mode again, and repeat the the
   Countermeasure
                      conveyor pulse value has changed significantly.execution.
   Number               271
   Message              The conveyor pulse value has changed significantly.
   When error
                        During playback
   occurred
   Cause                This error results if the pulse frequency exceeds 10 kHz.
   Countermeasure       Check the pulse generator for trouble.
   Number               704
   Message              Illegal conveyor register value
   When error
                        During playback
   occurred
                        This error results when the conveyor register value has exceeded the “Failure detection
   Cause
                        just after playback” level.
   Countermeasure       Check the conveyor pulse input circuit.
   Number             895
   Message            The conveyor has not moved.
   When error
                      After start LS input
   occurred
                        This error results when “Normal” is established as the conveyor synchronization mode,
   Cause
                        and the conveyor pulses fail to change for 1 or more seconds after the start LS input.
                        Check whether the conveyor is operating. Check the connecting cable from the pulse
   Countermeasure
                        generator.
   Number               897
   Message              The change in the conveyor pulses is too low.
   When error
                        After start LS input
   occurred
                        This error results if the conveyor pulse value does not satisfy the “Pulse check error
   Cause                level” value even though the “Pulse check start time” has elapsed after the conveyor
                        start LS signal was input.
                        Increase the difference between the input timing of the conveyor start LS signal and of
   Countermeasure
                        the start command.
                                                                                                              6-1
6.1 List of error codes
             Number            1140
             Message           The conveyor mode cannot be changed during playback.
             When error        This error results when an attempt has been made to change the conveyor mode during
             occurred          playback.
             Cause             An attempt has been made to change the conveyor mode during playback.
             Countermeasure     To change the conveyor mode, first stop the robot and then proceed.
             Number             1181
             Message            The conveyor operation underway signal has been turned OFF.
             When error
                                During normal playback
             occurred
                                This warning is given when the conveyor operation underway signal turns OFF or when
             Cause
                                it fails to turn ON during normal playback.
             Countermeasure     Turn the conveyor operation underway signal ON for normal playback.
             Number             2272
             Message            The conveyor operation underway signal has been input.
             When error
                                During Simulation, Test playback
             occurred
                                This error results when the conveyor operation underway signal has been input while
             Cause
                                “Simulation” or “Test” is established as the conveyor synchronization mode.
             Countermeasure     Turn the conveyor operation underway input signal to OFF.
6.1.2 Alarm
             Number             2174
             Message            This function cannot be used during conveyor synchronization.
             When error
                                During normal playback
             occurred
             Cause              A function which cannot be used during conveyor synchronization has been used.
             Countermeasure     Record this function command in a step which is not a conveyor synchronization step.
             Number             2230
             Message            Conveyor synchronization is invalid.
             When error
                                During function command playback.
             occurred
                                This alarm results when a conveyor-related function has been executed even though
             Cause
                                the conveyor was not registered at the formatting stage.
             Countermeasure     Check whether the conveyor has been registered.
              Number           2805
              Message          Mechanism number is wrong.
              Timing of
                               When executing FN274.
              occurrence
              Cause            This error results when the mechanism, specified in FN274, is mechanism number that
                               cannot be switched.
              Countermeasure   Check the number.
6.1.3 Information
             Number             3181
             Message            The conveyor operation underway signal has been turned OFF.
             When error
                                During normal playback
             occurred
                                This information results when the conveyor operation underway signal turns OFF or
             Cause
                                when it fails to turn ON during normal playback.
             Countermeasure     Turn the conveyor operation underway signal ON for normal playback.
6-2
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