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APPX
Appendix 6 List of Safety Special Relay Areas
Appendix 6 List of Safety Special Relay Areas
The following table lists items in the list.
*1 As an operation from the GOT or other external devices, only data read is available.
Do not change the data set by the system in a program or by a device test. Doing so may result in system
down or communication failure.
Item Description
No. Safety special relay number
Name Safety special relay name
Description Data stored in the safety special relay and its meaning
Details Detailed description of the data stored
Set by (setting timing) Set side of data (system or user) and timing when data is set by the system
<Set by>
•S: System
• U: User (safety program, engineering tool)
*1
• U/S: User and system
<Set timing>
• Every END: Data is set every time END processing is performed.
• Initial: Data is set when initial processing is performed (e.g. powering on the system, changing the operating status from
STOP to RUN).
• Status change: Data is set when the status is changed.
• Error: Data is set when an error occurs.
• Instruction execution: Data is set when an instruction is executed.
• Request: Data is set when requested by a user (using the safety special relay).
• Writing: Data is set when a user performs a writing operation.
• During END: Data is set when END processing is performed.
• Power-on to RUN or STOP to RUN: Data is set when the operating status changes from power-on to RUN or from
STOP to RUN.
CPU The following shows the supported CPU modules. Each of the CPU module is represented by the following symbols.
• Rn: Programmable controller CPU
• RnP: Process CPU
• RnPSF: SIL2 Process CPU
• RnSF: Safety CPU
• ALL: All the above CPU modules
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