20.3 ERROR MESSAGE AND SYSTEM ALARM
20.3.2 List of Error Message/System Alarm
20 - 27
17
ADDITION TIMES RESET
FOR MAINTENANCE TIME
NOTIFICATION
18
INSTALLATION OF
COREOS, BOOTOS AND
STANDARD MONITOR OS
19
MAINTENANCE AND
INSPECTION
20
TROUBLESHOOTING
APPENDICESINDEX
450
Path has changed or
timeout occurred in
redundant system.
The path has been switched or timeout occurred in the
redundant system.
1. Check the PLC CPU to know if the path has been
switched.
2. Check the cable connection status, the communication
unit installation status, and the PLC CPU status.
3. This error may occur when the load of the PLC CPU
becomes heavier when accessing other stations. In such
a case, transfer the data of the other stations to the host
station PLC CPU and monitor them at the host.
4. Perform one of the following operations if the PLC
scanning time is long: COM instruction/Extension of END
processing/Setting of the number of processing times for
general data/Data update batch processing.
451
Q redundant system
settings and current
config. do not match.
Change the Q redundant setting in accordance with the actual
Q redundant CPU system.
460 Communication unit error
1. Reset the power of the GOT.
2. Replace the unit.
480
Communication channel
not set. Set channel
number on Utility.
Channel (CH.No.1 to 4) to communicate with a controller is
not set.
1. After setting the Communication Settings on the GT
Designer3 or GT Designer2, download it to the GOT.
2. Change the channel assignment in the Communication
Setting on the utility.
*1
481
Communication unit not
mounted to the slot of
active channel.
The interface where the channel (CH No.1 to 4) is set does
not have a communication unit installed.
1. Install a communication unit to the interface where the
channel (CH No.1 to 4) is set.
2. Change assignment of the channel (CH No.1 to 4) in the
Communication Setting.
*1
482
Too many same units are
mounted. Confirm the no
of units.
Units are mounted on the GOT exceeding the maximum
number of mountable units.
Check the number of units, and remove unnecessary units.
*1
483
Simultaneous mounting of
the units are not allowed.
Two or more units which cannot be mounted on the GOT
simultaneously are mounted.
Check the mounted units, and remove unnecessary units.
*1
484
Unit mounted incorrectly.
Move the unit to correct
position.
The unit is not mounted on the GOT in the correct position.
Confirm the mounting position of the unit.
*1
485
Too many units mounted
on GOT. Reduce units.
Units are mounted on the GOT exceeding the maximum
number of mountable units.
Check the number of units, and remove unnecessary units.
*1
Error
code
Error message Action
Channel
No.
storage
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