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12
TROUBLESHOOTING
12.2 Troubleshooting Flowchart
12.2.8 When the "USER" LED turns on
12 - 14
9
EMC AND LOW
VOLTAGE
DIRECTIVES
10
LOADING AND
INSTALLATION
11
MAINTENANCE AND
INSPECTION
12
TROUBLESHOOTING APPENDICES INDEX
Remark
The following causes are possible when the "ERR." LED of the CPU module
flashes at programmable controller power-on.
12.2.8 When the "USER" LED turns on
If the "USER" LED turns on, follow the steps described below.
The "USER" LED turns on when an error is detected by the annunciator (F) turns on.
If the "USER" LED turns on, monitor the special relay SM62 and the special registers
SD62 to SD79 in the monitor mode of GX Developer.
• When M62 has turned ON
The annunciator (F) is ON.
Using SD62 to SD79, check the error cause.
Eliminate the error cause after confirming it.
The "USER" LED can be turned off by:
• Making a reset with the RUN/STOP/RESET switch.
• Canceling Errors with the special relay and the special register
( Section 12.4)
Table12.2 Error messages and causes
Error Message Cause Corrective Action
MODULE LAYOUT
ERROR
(Error code: 2125)
The multiple CPU system is
configured.
Remove all CPU modules other
than the safety CPU module from
the base unit.
Modules other than intelligent
function modules are mounted on
the base unit.
Remove all modules other than
intelligent function modules from
the base unit.
CC-LINK PARAMETER
ERROR
(Error code: 3105)
The CC-Link Safety master
module mounted on the base unit
is not set as a master station.
Set the CC-Link Safety master
module as a master station.
NETWORK PARAMETER
ERROR
(Error code: 3100)
• The MELSECNET/H module
mounted on the base unit is not
set as a PLC to PLC network
normal station.
• The number of CC-Link IE Field
Network master/local modules
(with safety functions) actually
mounted is different from that is
set in Network parameter for
CC-Link IE Field Network.
• Set the MELSECNET/H module
as a PLC to PLC network
normal station.
• Mount or remove the CC-Link
IE Field Network master/local
modules (with safety functions)
so that the number matches
that is set in Network
parameter.
NETWORK PARAMETER
ERROR
(Error code: 3103)
The number of Ethernet modules
actually mounted is different from
that is set in Network parameter
for Ethernet.
Change either the number of
modules or parameter setting so
that they become the same.