EDM FB for NX Safety Quick Start Guide
This guide describes how to use an EDM (External Device Monitoring) function block using Sysmac
Studio. EDM is almost always the function block used to allow final actuation of the equipment.
Overview
Items needed: Sysmac Studio, version 1.07 or higher.
Quick Summary
1.) Node setting – See chart under “Node Set-up”.
2.) Set up each mode’s variable name in the I/O map.
3.) Function block - SF_EDM, entering variable names as inputs
Description
For the purposes of this document, two single channel contactors will be used.
Additional Information
www.omron247.com.
Z931 manual – NX-series Safety Control Unit
Function block details
Z930 manual - Safety Control Unit
Application examples in appendix
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Node Set-up
Sysmac Studio steps: Multiview explorer -> Select Safety CPU -> Configuration and setup -> Communications -> Safety -> Safety I/O -> Select a
node -> double click on parameters -> click on the white X next to the filter to see all of the nodes -> use toolbox to select a safety device (might
need to drag right side window to see the toolbox) -> drag and drop parameter to knob -> complete for all nodes. Note: The fields in the nodes are
not used in the program. Could be used to enter part name/type/number.
Use Mechanical contact for single channel. Keep the default test pulses.
I/O Map
Sysmac Studio steps: Multiview Explorer -> select Safety CPU -> Configurations and Setup -> double click on I/O Map -> make sure arrown buttons
are all pointing down -> use variable template to paste (Note: It will not paste if there is an empty field. Can only do groups when no empty
fields.) OR manually enter with right click OR scroll down to highlight all variables -> right click -> select variable. (Note: Do not enter a variable
name for the second input or output of dual channel devices.)
Enter the input variable name into the I/O map.
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SF_EDM Function Block Inputs
Sysmac Studio steps: Multiview Explorer -> select new_safetyCPU -> Programming -> POU -> Programs -> Program0
Toolbox -> Safety Function Blocks -> left click on a function block and drag onto the white part of the screen until you see a box that says "start
here" and it turns green
Click on white space next to the inputs (always on left side of the FB) -> click on the box with the three dots -> make sure "global variables" is
selected under "categories", then select the input from the list OR start to type and select input from pulldown list. Inputs highlighted in yellow
and start with S_ require a SAFE variable type.
Enter the inputs for S_EDM1 and S_EDM2. If it is single channel, use the same variable name for
both inputs.
SF_ EmergencyStop Function Block Outputs
Sysmac Studio steps: Click on white space next to the outputs (always on right side of the FB) -> click on the box with the three dots -> make sure
"global variables" is selected under "categories", then select the input from the list. Outputs highlighted in yellow and start with S_ require a
SAFE variable type.
Enter the output.
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Other Input and Output options
S_StartReset Input
Does a reset button need to be pressed at start-up?
Default value is left blank is false.
If no, enter “True”. (Setting in all examples and needed for simuation.)
Reset
Enter the variable name for the reset button. (Note: Reset is a reserved variable so either pick a new
another name or add an extension.)
Enter TRUE is no reset button is being used.
MonitoringTime
Enter variable name such as “Max_Feedback_Time.”
Then define the length in the internal variable list. (This method will give you the correct time format.)
Name
Give the function block a unique name.
Reduce function block size
Right click the mouse inside the function block –> Remove unused FB call parameters
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Wiring
Notes on dual channel devices:
1.) first input starts with T0
2.) consecutive order (i.e. Si4 and Si5)
3.) wired into the same module **
** If wired into different input modules, the timing of the test pulse signals may be out of sync and
cause false shut-downs.
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