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Troubleshooting
Error codes from DLCU
Error code 51, CHECKSUM FROM CPU
DLCU has detected an error in the internal communication between DLCU
and CPU. The DLCU processor will reset itself when the error has disap-
peared.
CPU reads the error message when the program starts and finishes and
generates an error code, the error message is ignored between these two
occasions.
Reason:
Strong interference from surrounding equipment etc. can cause error co-
des.
Action:
Re-set the error codes. If the error codes can not be re-generated or if they
return, rectify the adjacent equipment that causes the interference. If this
does not help, try changing the CPU board, since the interference sensiti-
vity of different CPU boards can vary to some extent.