5 Error Processing, Maintenance and Inspection
5-2
CJ-series High-speed Counter Units Operation Manual for NJ-series CPU Unit(W492)
5-1
Error Indicators
The RUN-, ERC-, and ERH-LEDs, at the front panel of the High-speed Counter Unit, display the follow-
ing errors.
5-1-1
Errors during initial processing
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 contents of the settings
for device variables for CJ-
series Unit (for setting)
Check the error code with *_ErrCode1
(error code 1) and *_ErrCode2 (Error
code 2), set the device variables for CJ-
series Unit (for setting) (unit setting)
again correctly. Restart the Unit or reset
the Controller.
Refer to 5-2 Error codes for more infor-
mation 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
Restart the Unit or reset the Controller.
If errors reoccur, 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
CH1
CH2
ERC
ERH
A
A
B
B
Z
Z
I0
I1
O0
O1
CT021