37 FUNCTIONS
37.16 RAS Functions
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37.16 RAS Functions
This section describes the RAS functions of the SIL2 Process CPU.
Self-diagnostic function
This section describes the self-diagnostic function of the SIL2 Process CPU module and SIL2 function module. As for the
SIL2 Process CPU, only the parts that differ from the standard CPU are described.
How to check errors
Errors in the SIL2 Process CPU can be checked in the same way as for the standard CPU. ( Page 127 Self-Diagnostics
Function)
Errors in the SIL2 function module can be checked in the following ways.
■Using the buffer memory
When the SIL2 function module detects an error, the corresponding error code is stored in Un\G0 (Latest self-diagnostics
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-diagnostics error code 1) to Un\G25 (Self-diagnostics error code 16). (The error codes of the 17th error and later
are not stored.)
■Using the LED on 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 the errors to set whether or not to be detected in the SIL2 Process CPU.
Error name Error code
Power shutoff (either of the redundant power supply modules) 1010H
Failure (either of the redundant power supply modules) 1020H
Battery error 1090H
Module verification error 2400H, 2401H
Fuse blown error 2420H
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