Chapter 28 Self-Diagnostics Function; Self-Diagnostics Timing; Error Status Check - Mitsubishi Electric MELSEC iQ-R Series User Manual

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SELF-DIAGNOSTICS FUNCTION
This function diagnoses whether there are any errors in this product.
Precautions
Depending on the error occurrence status, errors may not be detected by the self-diagnostics function. Configure safety
circuits external to the system to ensure that the entire system operates safely even when this product is not stopped by the
function.
28.1

Self-diagnostics Timing

If an error occurs at the start or during operation of this product, the detected error information is displayed.
An error is detected even when Windows is shut down or stopped.
28.2

Error Status Check

A detected error can be checked by the following methods.
Special relays or special registers
When an error is detected, the special relays (SM0, SM1) are turned ON, and an error code corresponding to the error is
stored in the special register (SD0). If more than one error are detected, the latest error code is stored in the special register
(SD0).
Up to 16 error codes (latest errors occurred on the system) will be stored in the special registers (SD10 to SD25).
CW Configurator
The error occurrence of the entire system, latest errors occurred, and event history can be checked in the module diagnostics
screen. (CW Configurator Operating Manual)
Up to 16 latest errors occurred in this product 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 in the event history. (Page 215 EVENT HISTORY FUNCTION)
Up to 15 continuation errors and 2 stop errors can be displayed. If 15 continuation errors are displayed, new
continuation errors will not be displayed. In addition, if the new error has the same error code as the already
displayed error, the error occurrence date/time and its detailed information will not be updated.
28 SELF-DIAGNOSTICS FUNCTION
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28.1 Self-diagnostics Timing