Description Cause Corrective action
Hardware watchdog
timer error
Unit disconnection
during operations
Make sure that the Units are connected correctly.
Illegal user program Refer to 6-3-3 Initialization of CPU Unit Using USB Memory on
page 6-
8, and execute re-initialization.
Ingress of conductive
object
If there is conductive material nearby, blow air through the CPU
Unit.
Noise If the error did not result from the above causes, cycle the power
to the Controller and see if that resets the error
. If the error oc-
curs frequently, check the FG and power supply lines to see if
noise is entering on them. Implement noise countermeasures as
required.
CPU Unit failure If the error persists even after you make the above corrections,
replace the CPU Unit.
Initial process error Ingress of conductive
object
If there is conductive material nearby, blow air through the CPU
Unit.
Noise If the error did not result from the above causes, cycle the power
to the Controller and see if that resets the error
. If the error oc-
curs frequently, check noise entry paths such as the FG and the
power supply lines and implement noise countermeasures as re-
quired.
CPU Unit failure If the error persists even after you make the above corrections,
replace the CPU Unit.
6-3-2
Non-fatal errors in the CPU Unit
For non-fatal errors in the CPU Unit, take the following corrective actions depending on the nature of
the error
.
Description Cause Corrective action
EtherCAT physical layer link
not established
The Ethernet cable used for
EtherCA
T communications is
broken or the specified cable
is not being used.
If the Ethernet cable is broken or if the speci-
fied cable is not being used, replace the cable.
Disconnected connector on
the Ethernet cable used for
EtherCA
T communications,
contact failure, or part failure
Reconnect the connector and check to ensure
it is mated correctly.
Power is not supplied to the
first slave connected to the
CPU Unit.
Supply power to the slave.
Failure of slave within Ether-
CA
T network configuration
Replace the slave.
Noise Check noise entry paths, and implement
noise-related countermeasures as required.
CPU Unit failure Replace the CPU Unit.
6 Troubleshooting
6-6
CK3M-series Programmable Multi-Axis Controller User's Manual Hardware (O036)
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