Omron CS1W-CT021, Operation Manual

Page: 157 / 201

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Section 5-1
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5-1 Error Indicators
The RUN-, ERC-, and ERH-LEDs, at the front panel of the High-speed Counter
Unit, display the following errors.
5-1-1 Errors during initial processing
5-1-2 Errors during normal operation
RUN ERC ERH
RUN ERC ERH Error Probable cause Remedy
OFF OFF ON Setup error Incorrect Unit number
Cyclic initial error Set correct Unit number and turn
ON the power again
OFF ON OFF DM-configuration
error Invalid DM-setting(s) Check the Error Code(s) in CIO
(words n+17, n+18), correct the
invalid DM-setting(s) and turn ON
the power again. Refer to 5-2
"Error
codes" for more information on error
codes and how to clear them.
Unit error An error occurred in the
Unit’s EEPROM, RAM or
CPU or a system software
error occurred Turn OFF and then ON the power
again. If errors reoccurs then
replace the High-speed Counter
Unit
OFF ON ON Unit classification
error The Unit classification was
set incorrectly Replace the High-speed Counter
Unit
OFF OFF OFF Watch Dog Timer
time-out error The Unit’s Watch Dog Timer
has timed out Turn OFF and then ON the power
again. If errors reoccurs then
replace the High-speed Counter
Unit
RUN ERC ERH Error Probable cause Remedy
ON ON OFF Unit error Invalid operands specified
in IOWR-instruction
Overflow or underflow of
Simple or Linear Counter
Preset error
Unit interrupt FIFO is full 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.
ON OFF ON System error PLC Watch Dog Timer error
Fatal error
Non-fatal error
Cyclic Monitor error
I/O Bus error Extend the cyclic monitor time or
remove the cause of the fatal or non-
fatal error. If the error reoccurs then
replace the CS1-CPU. Refer to 5-2-6
"System Errors" for more
information.
W902-E2-03.book Seite 142 Donnerstag, 7. Oktober 2004 2:06 14