Omron trajexia CJ1W-MCH72 Operation Manual page 364

Troubleshooting Errors
6-3-10 CPU Non-Fatal Error (FAL)
6-3-11 MECHATROLINK-II Bus Error
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Problem
A non-fatal error (FAL) generated by the
PLC CPU, either by the system or
programmatically (from a PLC ladder
program).
Additional actions to take:
When this error occurs, the unit continues operation normally as no error has
occurred. If any action on this error is necessary, a user can take additional actions in
BASIC programs when this error happen. The occurrence of this error can be checked
for by reading bit 3 of the value returned by the PLC_STATUS(0) BASIC command
(see section 4-2-185 for more details on PLC_STATUS BASIC command).
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Problem
Cable failure on the MECHATROLINK-II
bus.
MECHATROLINK-II bus terminator is
missing or damaged (bit 17 of the
SYSTEM_ERROR system parameter is
high, see section 4-2-234 for more details
on this parameter).
The MECHATROLINK-II station connected
to the unit is lost due to power off or
MECHATROLINK-II interface failure at the
station (bit 18 of the SYSTEM_ERROR
system parameter is high, see section
4-2-234 for more details on this
parameter).
The MECHATROLINK-II The
CJ1W-MCH72 is defective.
Solution
Remove the cause of the problem in the
PLC, if it wasn't generated
programmatically on purpose.
Solution
Check MECHATROLINK-II cables
between stations connected to the unit for
interruptions and irregularities (short
circuit between communication lines A
and B, short circuit of any communication
line with shielding).
Fit a MECHATROLINK-II bus terminator
on the last station in the chain or replace
it.
Check the power and MECHATROLINK-II
interface of the station that caused the
problem. Replace the station if necessary.
Replace the CJ1W-MCH72 unit.
Section 6-3
353