Control Station

Function Code 80

M /A There are three types of stations, each controllable through a

M F C /P digital (NDCS03) or analog (IISAC01) control station and/or a
S1 (8 0 )
S2
PV SP
N+1 human system interface (HSI). The types include basic, cas-
SP O
S3
A A
N cade and ratio stations.
S4 N+2
TR C /R
N+4
S5
TS C A basic station generates a set point (SP) and provides man-
S18 N+3
S19
MI C -F
N+5 ual/automatic transfers, control output adjustments in man-
AX
S20
C /R
ual control mode, and set point adjustments in automatic
S21
LX control mode.
S22
CX
S24
S25
HAA A cascade station provides the same functions as a basic sta-
L AA
S26
H DA
tion plus an additional mode that allows the set point to be
S27
L DA controlled by external input signal <S2>.
S28
AO
S29
S30
TRS2 A ratio station provides the same functions as a basic station,
TRPV T
but differs from the cascade station in its method of set point
generation while in the ratio mode. The wild variable <S2>
multiplied by a ratio adjustment factor (ratio index) determines
the set point output while in ratio mode. The initial ratio index
value is calculated by the station to maintain the current set
point output value when the station is placed into the ratio
mode. While in the ratio mode, the ratio index value is dis-
played in place of the set point value and can be adjusted
(ramped up or down) by the operator to obtain the desired set
point output.

Station control allows changing the mode, set point, ratio

index and control output of a control station by manipulating
a control station element.

The control output (CO) value during startup is configurable. If

S16 defines a DCS station (S16 equals zero through seven) or
SAC station (S16 equals zero through 63), then the control
output during startup tracks the displayed control output on
the DCS station or SAC station. If a communication failure
exists for the station (or S16 equals 255), then the control out-
put tracks the CO track signal <S4> during startup.

NOTE: Valid station addresses are zero through 63 and 100 through 163 for
Harmony controllers at 40 kilobaud.

WBPEEUI210504C0 80 - 1
 The associated analog output (AO) <S28> generates
auto-bypass when the AO has bad quality and communicates
this state to the control interface module analog output.

NOTES:
1. The maximum ratio for the wild variable is ten when using a DCS station
and 100 when using a SAC station. The minimum practical ratio is 0.05.

2. The local SAC/DCS link communication baud rate is set by the hundreds
digit S3 of the extended executive block (function code 90, block 20) for Har-
mony controllers. The remote SAC link located on CIO-100 Harmony I/O
blocks is not affected by the S3 specification setting.

Outputs

Blk Type Description

N R Control output (0% to 100%)
N+1 R Set point
N+2 B Automatic mode flag:
0 = manual
1 = automatic
N+3 B Level flag:
0 = local
1 = computer
N+4 B Cascade/ratio mode flag:
0 = basic
1 = cascade/ratio
N+5 B Computer status flag:
0 = computer OK
1 = computer failed

Specifications

Spec Tune Default Type Range Description

S1 N 5 I Note 1 Block address of input to be displayed on the PV
scale of a station (can be used for SP track S30)
S2 N 5 I Note 1 Block address of SP track signal (S29 SP track
switch)
S3 N 5 I Note 1 Block address of auto signal
S4 N 5 I Note 1 Block address of control output track signal (TR)
S5 N 0 I Note 1 Block address of control output track switch (TS):
0 = no track
1 = track

80 - 2 WBPEEUI210504C0
 Specifications (continued)

Spec Tune Default Type Range Description

S6 N 5 I 1, 2, 3, Initial mode of station after startup:
5, 6, 7 1 = computer, manual
or 8 2 = computer, auto
3 = computer, cascade/ratio
5 = local, manual
6 = local, auto
7 = local, cascade/ratio
8 = previous mode
S7 Y2 9.2 E 18 R Full PV high alarm point in engineering units
S8 Y2 -9.2 E 18 R Full PV low alarm point in engineering units
S9 Y2 9.2 E 18 R Full PV-SP deviation alarm point in engineering units
(for console only)
S10 N 100.000 R Full Signal span of PV in engineering units
S11 N 0.000 R Full Zero value of PV in engineering units
S12 N 0 I Full PV engineering units identifier (for console only)
S13 N -5.000 R Full Signal span of SP in engineering units
S14 N 0.000 R Full Zero value of SP in engineering units
S15 N 0 I Full SP engineering units identifier (for OIS console only)
S16 N 255 I Full Control station address:
254 = passive station
255 = no station
S17 N 0 I 0-7 Mode of system default if the computer fails while
the loop is under computer control:
0 = computer (auto/manual mode unchanged)
1 = computer, manual
2 = computer, auto
3 = computer, cascade/ratio
4 = local (auto/manual mode unchanged)
5 = local, manual
6 = local, auto
7 = local, cascade/ratio
S18 N 0 I Note 1 Block address of the transfer to manual signal:
0 = no transfer
1 = transfer to manual and hold
S19 N 0 I Note 1 Block address of the transfer to auto signal:
0 = no transfer
1 = transfer to auto and hold
S20 N 0 I Note 1 Block address of the transfer to cascade/ratio signal:
0 = no transfer
1 = transfer to cascade/ratio and hold

WBPEEUI210504C0 80 - 3
Specifications (continued)

Spec Tune Default Type Range Description

S21 N 0 I Note 1 Block address of the transfer to local signal:
0 = no transfer
1 = transfer to local and hold
S22 N 0 I Note 1 Block address of the transfer to computer signal:
0 = no transfer
1 = transfer to computer and hold
S23 N 0 I 0-4 Station type:
0 = basic with set point
1 = basic without set point
2 = basic with bias
3 = ratio
4 = cascade
S24 N 0 I Note 1 Block address of external high absolute alarm flag:
0 = no alarm
1 = high absolute alarm
S25 N 0 I Note 1 Block address of external low absolute alarm flag:
0 = no alarm
1 = low absolute alarm
S26 N 0 I Note 1 Block address of external high deviation alarm flag:
0 = no alarm
1 = high deviation alarm
S27 N 0 I Note 1 Block address of external low deviation alarm flag:
0 = no alarm
1 = low deviation alarm
S28 N 2 I Note 1 Block address of analog output associated with this
station
S29 N 0 I Note 1 Block address of switch to have SP track <S2>:
0 = no track
1 = track <S2>
S30 N 0 I Note 1 Block address of switch to have SP track <S1> (PV):
0 = no track
1 = track <S1>
S31 N 60.000 R Full Computer watchdog time period (in secs)
NOTES:
1. Maximum values are: 9,998 for the BRC-100, IMMFP11/12
31,998 for the HAC
2. Specification is tunable, but not adaptable.

80 - 4 WBPEEUI210504C0
 Explanation
Outputs
N Control output expressed in percent. The station mode and the
control output auto <S3> input determine the control output.
N+1 Set point expressed in engineering units. The input to <S2>
and the station mode determine the set point output.
N+2 Mode indicator.

0 = manual
1 = automatic
N+3 Level indicator.

0 = local
1 = computer
N+4 Station mode indicator.

0 = basic
1 = cascade/ratio
N+5 Computer status flag.

0 = computer OK
1 = computer failed, station mode dependent on S17

Specifications
S1 – PV Block address of the input to be displayed on the PV scale of a
station (can be used for SP track S30). This input drives the
control station process variable indicator (in engineering
units).
S2 – SPT Set point track signal. For stations in basic mode, S2 is an
external set point track signal. For stations in the cascade
mode, <S2> is the cascade input. For stations in ratio mode,
<S2> is the uncontrolled or wild variable. Table 80-1 shows
the track behavior of the station block.

NOTE: For stations in ratio mode, the wild variable must be limited to positive
numbers, and the set point range must be a positive number. Low limits on
either signal must not be less than zero.

WBPEEUI210504C0 80 - 5
 Table 80-1. Track Behavior of the Station Block

Station Mode Manual Auto Cascade Ratio

Basic A A — —
Cascade A A B —
Ratio A A — C
NOTE:
A = When the station tracks and what it tracks depends on <S29> and <S30>. Specification S29
indicates when <S2> should be tracked, and <S30> indicates when <S1> should be tracked. If both
indicate tracking, <S29> takes precedence.
B = Specification S2 is tracked unconditionally and the station displays <S2>.
C = Specification S2 multiplied by the ratio index (displayed in digital set point display), is tracked
unconditionally and the product of <S2> and the ratio index displays on the station bar graph.

S3 – CO AUTO Block number whose output value is the control output when
the station is in automatic mode (usually the output of a PID
block).
S4 – CO TRACK Block number whose output is the control output when the
station is tracking (<S5> equals one). Specification S4 also
provides a reference for the station control output when the
module completes its startup mode, if an active hard station is
not present.
S5 – CO SWITCH Block number whose output value determines whether the
control output is to track <S4>.

0 = no tracking
1 = track

NOTE: Both the MAN and AUTO lights on the digital control station (NDCS01)
light when the module is in the control output override mode (tracking). For the
NDCS03 station, just the track light is displayed. The manual/auto status flag
does not change when in override state. The actual operating state is saved
and will be restored when the track flag goes to zero (normal). This note is not
applicable to the analog control station (IISAC01).
S6 – SMODE Initial mode of the station after startup. For the configurable
startup period after power up/reset/switch to execute mode,
the station will be in local manual mode. After the startup
period expires, the mode is as indicated by S6 unless overrid-
den by <S18> to <S22>. Specifications <S18> through <S22>
change the station mode and control level through logic. Any of
these specifications override S6. When adding a station block
with S6 set to previous mode (eight), the actual mode will be
local manual until modified by the operator or logic. When

80 - 6 WBPEEUI210504C0
 selecting computer or local cascade ratio, cascade or ratio con-
trol will be implemented depending on S23 (station type).

1 = computer manual
2 = computer auto
3 = computer cascade/ratio
5 = local manual
6 = local auto
7 = local cascade/ratio
8 = previous mode
S7 – PVH Sets the engineering units value of the process variable that a
high alarm generates and displays on the Human System
Interface (HSI).
S8 – PVL Sets the engineering units value of the process variable that a
low alarm generates and displays on the control station or
HSI.
S9 – PVDEV Engineering units value of allowed deviation between the pro-
cess variable and set point. A high deviation alarm generates
when the process variable is greater than the set point and the
value of the difference between the two is greater than or equal
to S9. A low deviation alarm generates when the process vari-
able is less than the set point and the value of the difference
between the two is greater than or equal to S9. These alarm
conditions report to the HSI.
S10 – PVSPAN Sets the signal span of the process variable in engineering
units.
S11 – PVZERO Zero value of the process variable in engineering units.
S12 – PVEU Process variable engineering units identifier, used by the HSI.
S13 – SPSPAN Sets the signal span of set point in engineering units. When
left at default, set point span equals span defined by S10. The
default setting for S13 is -5.000. It should be noted that HSIs
will display the PV span (S10) for the set point span (S13). The
Harmony controllers use the PVSPAN (S10) and PVEU (S12)
for both the process variable and set point as long as the set
point span is set to the default value.

NOTE: Some DCS stations will not function correctly using the -5.000 default
value. If a problem exists, set S13 and S14 the same as S10 and S11.
S14 – SPZERO Zero value of set point in engineering units.

WBPEEUI210504C0 80 - 7
 S15 – SPEU Set point engineering units identifier, used by the HSI.
S16 – DCSADR Set S16 to the control station address (254 equals passive sta-
tion and 255 equals no station). Valid station addresses are
zero through seven and 100 through 107 for DCS stations,
and zero through 63 and 100 through 163 for SAC stations.
Addresses 100 through 163 represent actual station addresses
of zero to 63. If selecting addresses 100 through 163, the Har-
mony controllers will not report the status of the control sta-
tion in the module status or module problem reports. In all
other respects, station operation remains unchanged. This
specification must be set to 254 when a passive station inter-
face (function code 139) S1 points to this function code.

NOTE: Valid station addresses are zero through 63 and 100 through 163 for
Harmony controllers at 40 kilobaud.
S17 – CFAIL Defines the mode the station will default to in the event of a
computer failure while it is under computer control. When
selecting computer or local cascade/ratio, the station assumes
cascade or ratio control depending on S23.

0 = computer manual/auto mode unchanged

1 = computer manual
2 = computer auto
3 = computer cascade/ratio
4 = local manual/auto mode unchanged
5 = local manual
6 = local auto
7 = local cascade/ratio
S18 through S22 Block addresses that change the station mode and control
level through logic. If more than one (<S18> through <S22>)
are set, <S18> takes precedence over <S19>, which takes pre-
cedence over <S20>, etc. If the station is in manual mode,
<S20> places the station in automatic and cascade/ratio mode
simultaneously. When both <S21> and <S22> are set, <S21>
overrides <S22>.

NOTE: When one or more inputs to <S18> through <S22> equal one, the sta-
tion displays the interlock state. The station is locked in a particular mode. The
output cannot be changed by the operator unless S18 equals one. Inputs
<S18> through <S22> are typically driven by fault logic that places the control
loop in a known condition when a failure is detected. Removing an interlock
state leaves the current mode unchanged, but allows the operator to change
the mode.

80 - 8 WBPEEUI210504C0
 S18 – MANXFR Block address of the transfer to manual signal.

0 = no transfer
1 = transfer to manual
S19 – AUTOXFR Block address of the transfer to auto signal.

0 = no transfer
1 = transfer to auto
S20 – CSRXFR Block address of the transfer to cascade/ratio signal. This
specification transfers to cascade or ratio control depending on
the type of station selected with S23.

0 = no transfer
1 = transfer to cascade/ratio
S21 – LOCLXFR Block address of the transfer to local signal.

0 = no transfer
1 = transfer to local
S22 – CMPXFR Block address of the transfer to computer signal.

0 = no transfer
1 = transfer to computer
S23 – STNTYP Provides a choice between several station types for normal
operation. The definition of <S2> depends on S23. The value of
S23 also determines whether cascade or ratio control is
adopted when S6, S17 and <S20> are set to cascade/ratio
(refer to S6). This specification will not be fully operational
until the HSI display strategies are modified. Until that time,
only zero, three and four are valid type specifications.

0 = basic with set point

1 = basic without set point (presently not implemented)
2 = basic with bias (presently not implemented)
3 = ratio
4 = cascade
S24 through S27 Block addresses that provide a mechanism for external abso-
lute and deviation alarming. Specifications S24 and S25 can
be used for end of travel alarms. Specifications S24 through
S27 are logical ORed with their respective internal alarms,
defined by S7 through S9, to determine the alarm states pre-
sented to the operator.

WBPEEUI210504C0 80 - 9
 S24 – EHALRM Sets the external high absolute alarm flag.

0 = no alarm
1 = high absolute alarm
S25 – ELALRM Sets the external low absolute alarm flag.

0 = no alarm
1 = low absolute alarm
S26 – EHDALRM Sets the external high deviation alarm flag.

0 = no alarm
1 = high deviation alarm
S27 – ELDALRM Sets the external low deviation alarm flag.

0 = no alarm
1 = low deviation alarm
S28 – AOBLK Analog output block number associated with the station. Use
this specification for proper operation of bypass logic. When
S28 equals zero or two, it is not used. Any setting other than
zero or two must be a block number of the control interface
module (CIS) function code 79, the analog output/slave (ASO)
function code 149, the analog output/channel (AO/CH) func-
tion code 223, or the device definition (DD) function code 221.

NOTES:
1. Only the physical AO from function code 79 is referenced to check the
quality of the AO for auto bypass when the quality is bad. When using function
code 79, S28 should reference output block N+4 or N+5, not output block N.

2. When specification S28 is connected to block output number four of a

device definition (function code 221) function block, the bypass logic of the
control station (function code 80) function block operates in the same manner
as when specification S28 is set to zero or two. The operational difference
between referencing the device definition function block and setting specifica-
tion S28 to zero or two is that when specification S28 references the device
definition function block, the control station function block interfaces to a SAC
station attached to a control I/O (CIO) block.

3. When specification S28 is connected to the block output of an analog out-

put/channel (function code 223) function block and specification S16 specifies
a valid SAC address, the control station function block interfaces to a SAC sta-
tion attached to a control I/O block.

80 - 10 WBPEEUI210504C0
 4. When an analog out/channel (function code 223) function block is placed
into simulation (specification S15 of function code 223 set to 1) its associated
control station function block will place its SAC station (auto-bypass enabled)
into bypass operation with its demand output set to the last non-simulated con-
trol output value and function code 223 will not set the suspect bit. The
auto-bypass SAC station will remain in bypass operation until the simulation
option is disabled and the current control output value is set to match the con-
trol output value that was in effect prior to the simulation.

5. The IISAC01 analog control station bypass function takes a higher prece-
dence in the control of the analog output field element it shares in common with
the CIO 100 block. This means that the bypass functionality takes precedence
over function code 223 undefined, override, simulation, and normal modes of
operation. It also takes precedence over function code 79 undefined and nor-
mal modes of operation.

6. Specification S28 may be connected to an analog output channel (func-

tion code 223) that is associated with an AOT analog output channel. In this
application an IISAC01 is not used and S16 is set to 254 or 255. The station
(function code 80) function block will transfer to manual only if both redundant
AOT Harmony I/O blocks experience failures on that particular channel.

Specification S28 provides a way to automatically monitor the

CIO block/CIS module or AOT block/ASO module output
channel. Should the CIO block/CIS module or AOT block/ASO
module detect a fault on the current output, the station trans-
fers to manual. If using a control station with a CIO block/CIS
module, selecting auto-bypass on the station causes it to
transfer to bypass when the output faults.

NOTE: The HSI does not indicate that the station is in bypass or locked in man-
ual (as it does if S18 equals one).
S29 – SPTRCK Block address of the analog output set point track signal. This
determines the track behavior of the set point in conjunction
with <S30>. Specification S29 indicates when <S2> should be
tracked, and <S30> indicates when <S1> should be tracked. If
both indicate tracking, <S29> overrides <S30>. If this specifi-
cation equals one, it will cause the set point to track <S2>
whether the station is in manual or automatic mode. This
specification is not applicable when the station is in cascade
mode because the cascade input uses none of the internal sta-
tion logic for control.

0 = no track
1 = track <S2>

WBPEEUI210504C0 80 - 11
 S30 – PVTRCK Block address of the process variable track signal. It deter-
mines the track behavior of the set point in conjunction with
<S29>. Specification <S29> indicates <S2> should be tracked,
and <S30> indicates <S1> should be tracked. If both indicate
tracking, <S29> overrides <S30>. When <S30> equals one, it
causes the set point to track <S1> whether the station is in
automatic or manual mode. This specification is not applicable
when the station is in cascade mode because the cascade
input uses none of the internal station logic for set point con-
trol.

0 = no track
1 = track <S1>
S31 – CMPWDG Computer watchdog time-out interval times computer commu-
nications when a station is under computer control. Timing
starts when a computer OK message goes from the network
interface to the module, signifying that the computer received
all information transmitted from the module. The timer is reset
by each subsequent OK message from the network interface
and station variable settings.

For example, if the station is switched from manual to com-

puter control, a message will be sent to the network interface,
which will generate an OK message and initiate timing. If the
elapsed time between OK messages exceeds the value of S31,
the timer times out. The control mode is then determined by
the value of S17 (computer watchdog time-out option) in the
station. If the computer replies to a module message before the
time interval is over, the timer resets itself and begins timing
again with the next communication. The interval is selected in
seconds, with a default value of 60 seconds. An interval value
of 0.0 disables the computer watchdog time-out feature.

Applications
Figure 80-1 illustrates a single input, single output control
loop run by a control station in basic mode (function code 79).
This configuration uses a PID block for error correction. The
process variable and the control output interface with the field
devices through a control interface module block. If station
parameters such as process variable, set point, and control
output are to be trended, an AO/L block is not necessary
because the current values are obtained from the station
exception report. The exception reports are on the loop without

80 - 12 WBPEEUI210504C0
 an AO/L block. Only a trend block (function code 66 or 179) is
necessary.

Figure 80-2 shows how an auto bypass capable hardstation is

configured to operate on the remote SAC link of a CIO block
using function code 221, function code 223, and function code
80 function blocks interfaced to CIO/SAC01 hardware.

Figure 80-3 shows how an indicating only hardstation is con-

figured to operate on the remote SAC link of a CIO block using
function code 221, function code 223, and function code 80
function blocks interfaced to CIO/SAC01 hardware.

C IS I/O
(79 )
28 0
28 1
28 2
M /A 28 3
M F C /P 28 4
S1 (8 0) S 10
PV SP
PID S2 2 71
SP O
S2 (1 9) S3 2 70 28 5
S1 SP A A S 11
(3) S1 26 0 S4 2 72
S2 F (t) PV TR C /R
2 50 S3 S5 2 74
TR TS C 28 6
S4 S 18 2 73
TS MI C -F 28 7
S 19 2 75
AX 28 8
S 20 S 15
1 C AU SE S STATIO N TO
C /R
S 21 S 16
G O TO C IS FE E D BAC K LX
S 22 S 17
(S 28 ) O N M O D U LE CX
LAG D O ES N O T G O IN G TO EX E C U TE . S 24 S 18
HAA
W O R K IF N O T OT H ER W IS E , O U TP U T S 25
TU R N E D O N . W O U L D G O TO ZE RO L AA
S 26 28 9
D E FAU LT IS Z ER O. IF IT W AS A SO FT O IS Had
S TATIO N O N LY. S 27 L DA
S 28
AO
S 29 TRSE
S 30 T
TRPV

(66 ) TO O IS
S1
T R EN D 2 90
O R O TH E R
C O N SO LE
T 01 72 7 A

Figure 80-1. Single Input, Single Output Control Loop with Auto Bypass

WBPEEUI210504C0 80 - 13
 S1 M /A IO D /D E F
(3 ) M F C /P S2
S2 F (t) (8 0 )
CH01
1 N S1 S3
PV SP CH02
S2 N+1 S4
A P ID SP O CH03
S2 (1 5 6 ) S3 N S5
SP CO A A CH04
S1 N S4 N+2 S6
LAG D O ES N OT PV BI TR C /R CH05
W O R K IF N O T S3 N+1 S5 N+4 S7
TR BD TS C CH06
TURNED ON. S4 N+2 S18 N+3 S8
D E FAU LT IS Z E R O . TF MI C -F CH07
S5 S19 N+5 S9
R AX CH08
S6 S20 S10
FF C /R CH09
S7 S21 S11
N /A LX CH10
S8 S22 S12
N /A CX CH11
S9 S24 S13
II HAA CH12
S10 S25 S14
DI LA A CH13
S26 S15
H DA CH14
S27 S16
LDA CH15
S28 S17
AO CH16
S29 S18
TR S2 CH17
S30 S19
TR PV T CH18
S20
CH19
S21
CH20
S22
CH21
S23
CH22
IO C /A IN S24
S9 CH23
SHPG S25
S18 (2 2 2 ) CH24
S IM AI S26
S25 P E R M IT
S PA R E S29
C JR
S31
S PA R E
S33
S PA R E
IO C /AO U T (2 2 1 ) P R IM A RY
S2 N S TAT U S
AO B AC K U P
S14 (2 2 3 ) N + 1 S TAT U S
S IM AO
S21 OV R /S IM
S PA R E N +2
S PA R E
N +3
R E S E RV E D
N +4
T 0 0 81 0C

Figure 80-2. Single Input, Single Output Control Loop with Auto Bypass

80 - 14 WBPEEUI210504C0
 S1 M /A IO D /D E F
(3 ) M F C /P S2
S2 F (t) CH01
1 N S1 (8 0 ) S3
PV SP CH02
S2 N+1 S4
A P ID SP O CH03
S2 (1 5 6 ) S3 N S5
SP CO A A CH04
S1 N S4 N+2 S6
L AG D O E S N O T PV BI TR C /R CH05
W O R K IF N O T S3 N+1 S5 N+4 S7
TR BD TS C CH06
TURNED ON. S4 N+2 S18 N+3 S8
D E FAU LT IS Z E R O . TF MI C -F CH07
S5 S19 N+5 S9
R AX CH08
S6 S20 S10
FF C /R CH09
S7 S21 S11
N /A LX CH10
S8 S22 S12
N /A CX CH11
S9 S24 S13
II HAA CH12
S10 S25 S14
DI LA A CH13
S26 S15
H DA CH14
S27 S16
LDA CH15
S28 S17
AO CH16
S29 S18
TRS2 CH17
S30 S19
TRPV T CH18
S20
CH19
S21
CH20
S22
CH21
S23
CH22
IO C /A IN S24
S9 CH23
SHPG S25
S18 (2 2 2 ) CH24
S IM AI S26
S25 P E R M IT
S PA R E S29
C JR
S31
S PA R E
S33
IO C /AO U T S PA R E
S2 (2 2 1 ) P R IM A RY
AO
S14 (2 2 3 ) N S TAT U S
S IM AO B AC K U P
S21 S PA R E
N + 1 S TAT U S
OV R /S IM
N +2
S PA R E
N +3
R E S E RV E D
N +4
T 00 8 11 C

Figure 80-3. Single Input, Single Output Control Loop without Auto Bypass

WBPEEUI210504C0 80 - 15
WBPEEUI210504C0