Errors During Normal Operation - Omron CJ1W-CT021 Operation Manual

Error Indicators
5-1-2

Errors during normal operation

RUN ERC ERH
ON ON OFF
ON OFF ON
Error Probable cause
Unit error Invalid operands specified
in IOWR-instruction
Overflow or underflow of
Simple or Linear Counter
Preset error
Unit interrupt FIFO is full
System error PLC Watch Dog Timer error
Fatal error
Non-fatal error
Cyclic Monitor error
I/O Bus error
Remedy
Check the Error Code(s) in CIO
(words n+17, n+18). Apply
appropriate remedy according to the
cause of the error. Refer to 5-2 "Error
codes" for more information on error
codes and how to clear them.
If cyclic refreshing is disabled,
program the PLC so that a refresh
using the IORF-instruction is
executed every 11 or fewer seconds
or remove the cause of the fatal or
non-fatal error. If the error reoccurs,
then replace the CJ-series CPU Unit.
Refer to 5-2-6 "System Errors" for
more information.
Section 5-1
135