Chapter 6 Function of CPU Module
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(1) PLC hardware error
In case of heavy error that the normal operation of PLC such as CPU module, power module is disabled,
the system ‘stop’s and in case of light error such as battery error, it continues to operate.
(2)
Error in system configuration
This error occurs when hardware configuration of PLC is different from the configuration identified in
software, and the system stops.
(3)
Operation Error during User Program Proceeding
This is the error occurred during user program proceeding and in case of numeric operation error, it is
indicated in the error flag and the system continues to operate. While performing the operation, if the
operation time exceeds the scan watchdog time or the built-in I/O module can not be controlled normally,
the system stops.
Notes
1) The operation process is determined by selecting ‘Basic Parameters
→
Error Operation
Setup
→
Continue running when an arithmetic error occurs’.
2) The default is set to ‘Continue running when an arithmetic error occurs’.
(4)
Error detection by external device error
This is to detect the error of external control device by PLC user program. In case of heavy error, the
system stops but in case of light error, the system indicates the error state only and continues to operate.
Notes
1) If the error occurs, the error codes are saved in special relay F1026.
2) The error code is saved in F1027 when a soft-fault is detected.
3) For further information on the Flag, please refer to Appendix 1 Flag List.