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33 FUNCTIONS
33.8 RAS Functions
33.8 RAS Functions
This section describes the RAS functions of the safety CPU.
Self-diagnostic function
This section describes the self-diagnostic function of the Safety CPU module and safety function module. As for the Safety
CPU, only the parts that differ from the standard CPU are described.
How to check errors
Errors in the Safety CPU can be checked in the same way as for the standard CPU. ( Page 127 Self-Diagnostics
Function)
Errors in the safety function module can be checked in the following ways.
■Using the buffer memory
When the safety function module detects an error, the corresponding error code is stored in Un\G0 (Latest self-diagnostic
error code). If multiple errors are detected, the latest error code is stored in Un\G0. Up to 16 error codes can be stored in
Un\G10 (Self-diagnostic error code 1) to Un\G25 (Self-diagnostic error code 16). (The error codes of the 17th error and later
are not stored.)
■Using the LED of the safety function module
Like intelligent function modules, the error status can be checked with the ERROR LED. ( MELSEC iQ-R CPU Module
User's Manual (Startup))
■Using the engineering tool
Like intelligent function modules, the error status of the entire system and the history of errors currently occurred or events
can be checked on the "Module Diagnostics" window. ( GX Works3 Operating Manual)
Error detection setting
■Applicable errors to the error detection setting
The following table lists errors in the Safety CPU for which whether or not to detect the errors can be set.
CPU parameter setting for when an error is detected
The "Instruction Execution Error" setting under the "CPU Module Operation Setting at Error Detected" is applied only for
standard programs. A stop error always occurs in safety programs. (Even if "Continue" is selected, a stop error occurs.)
[CPU Parameter] [RAS Setting] [CPU Module Operation Setting at Error Detected]
■Applicable errors to the CPU module operation upon error detection setting
The following table lists the errors in the Safety CPU applicable to the setting that specifies the CPU module operation of
when the specific errors are detected.
Error name Error code
Battery error 1090H
Module verification error 2400H, 2401H
Fuse blown error 2420H
Error name Error code
Memory card error 2120H, 2121H
Module verification error 2400H, 2401H
Fuse blown error 2420H
I/O number or network number specification error 2800H, 2801H, 2802H, 2803H, 2804H, 2805H, 2806H, 2807H, 2810H
Device, label, or buffer memory specification error 2820H, 2821H, 2822H, 2823H, 2824H
File name specification error 2840H, 2841H, 2842H
Operation error 3400H, 3401H, 3402H, 3403H, 3404H, 3405H, 3406H, 3420H, 3421H,
3422H, 3423H, 3440H, 3441H, 34A0H
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