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12-130
-Self-diagnostic Error
This error occurs when the control unit (CPU unit) self-diagnostic function detects the occurrence of an
abnormality in the system. The self-diagnostic function monitors the memory abnormal detection, I/O
abnomal detection, and other devices.
When a self-diagnostic error occurs
- The ERROR turns on or flashes.
- The operation of the control unit (CPU unit) might stop depending on the contect of error and the
system
register setting.
- The error codes will be stored in the special data register DT9000(DT90000).
- In the case of operation error, the error address will stored in the DT9017(DT90017) and
DT9018(DT90018).
Clearing the self-diagnostic error
At the “STATUS DISPLAY”, execute the “error clear”. Error codes 43 and higher can be cleared.
-You can use the initialize/test switch to clear an error. However, this will also clear the contents of
operation memory.
-Errors can also be cleared by turning off and on the power while in the PROG.mode.
However, the contents of operation memory, not stored with the hold type data, will also be cleared.
-The error can also be cleared depending on the self-diagnostic error set instruction F148(ERR).
Steps to take for self-diagnostic error
The steps to be taken will differ depending on the error contents. For more details, use the error code
obtained above and consult the table of aself-diagnostic error codes.
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MEWTOCOL-COM Transmission Errors
These are error codes from a PC or other computer device that occur during an abnormal response
when communicating with a PLC using MEWTOCOL-COM.