5-51
5 Troubleshooting
NJ-series CPU Unit Hardware User’s Manual (W500)
5-2 Troubleshooting
5
5-2-4 Error Descriptions
Event name Impossible to Access Special Unit Event code 64010000 hex
Meaning An error occurred in data exchange between the CPU Unit and a Special Unit.
Source PLC Function Module Source details CJ-series Unit Detection
timing
Continuously
Error attributes Level Minor fault Recovery Reset error, cycle
power supply, or
reset Controller.
Log category System
Effects User program Continues. Operation The Special Unit stops.
System-defined
variables
Variable Data type Name
None --- ---
Cause and
correction
Assumed cause Correction Prevention
The setting of the rotary switches or a
DIP switch pin on a Special Unit is not
correct.
• The node address is not correct.
• The communications mode is not
correct.
• The baud rate is not correct.
Correct the setting of the rotary
switches or DIP switch pin on the
Special Unit. You can check the set-
ting error on the seven-segment dis-
play on the Special Unit.
Set the rotary switches and DIP
switch pins on the Special Units cor-
rectly.
An error occurred in the Special Unit. Refer to the relevant manual to trou-
bleshoot the error.
Refer to the Unit manual and use the
Unit correctly.
The Unit connection is faulty. Connect the Unit so that the connec-
tors mate correctly and slide the yel-
low sliders on the top and on the
bottom toward the back to lock them
into place.
Make sure that the Units are con-
nected correctly. Check for vibration
and shock.
Noise
• There is data corruption in bus sig-
nals.
If the error did not result from the
above causes, cycle the power to the
Controller and see if that clears the
error. If the error occurs frequently,
check the FG, power supply lines, and
other noise entry paths, and imple-
ment noise countermeasures as
required.
Implement noise countermeasures.
A Unit has failed. If the error did not result from the
above causes, and cycling the power
to the Controller or resetting the Con-
troller does not clear the error,
replace the Special Unit.
Perform regular inspections.
Attached
information
Attached information 1: Special I/O Unit: Error unit number + 20 hex
CPU But Unit: Error unit number + 10 hex
Attached information 2: System information
Precautions/
Remarks
None
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