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4.12
RAS Function
Self-diagnostic function
Diagnose the presence of any abnormality in the C Controller module itself.
Self-diagnostics timing
If an error occurred when the C Controller module is powered ON or while it is in the RUN/STOP state, the detected error
information is displayed, and the operation is stopped.
However, depending on the error occurrence status or the instruction to execute, the C Controller module may
not be able to detect the error. Configure safety circuits external to the system to ensure that the entire system
operates safely even in such a case.
Error checking methods
The following shows the error checking methods.
■Checking with special relays or special registers
When C Controller module detects any error, the special relays (SM0, SM1) turns ON, and an error code corresponding to the
error is stored in the special register (SD0). If more than one error is detected, the latest error code is stored in the special
register (SD0). Use the special relay (SM0, SM1) and special register (SD0) in the program for the C Controller module or
mechanical interlock. In addition, up to 16 error codes (latest errors occurred on the system) will be stored in the special
registers (SD10 to SD25). (The error codes for the 17th and onwards will not be stored.)
■Checking with CW Configurator
The error occurrence of the entire system, latest errors occurred, and event history can be checked in the module diagnostic
screen. (CW Configurator Operating Manual)
• In the C Controller module, maximum 16 latest errors occurred can be displayed. In addition, if an additional error occurs
after a stop error, the error information is not updated.
• Error logs can be checked using the event history function. (Page 68 Event history function)
The maximum number of continuation errors and stop errors to be displayed is 15 and 2 respectively. If
already 15 continuation errors have been displayed, then next continuation error will not be displayed. If the
error of the same code has been displayed, the date and time of occurrence and the detailed information
about the relevant error is updated.
4 BASIC FUNCTIONS
63
4.12 RAS Function
4
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