Mitsubishi MELSEC User Manual

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12.2 Troubleshooting Flowchart
12.2.8 When the "USER" LED turns on
12
TROUBLESHOOTING
Remark
The following causes are possible when the "ERR." LED of the CPU module
flashes at PLC 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)
Error Message Cause Corrective Action
MODULE LAYOUT
ERROR
(Error code: 2125)
The multiple CPU system is
configured.
Remove all CPUs except the
safety CPU from the base unit.
Modules except the following are
mounted on the base unit.
• CC-Link Safety master module
• CC-Link IE controller network
module
• MELSECNET/H module
• Ethernet module
Remove all modules other than
described on the left.
CC-LINK PARAMETER
ERROR
(Error code: 3105)
The CC-Link Safety master
module is mounted with
configuration not for a master
station.
Set the CC-Link Safety master
module to the master station.
NETWORK PARAMETER
ERROR
(Error code: 3100)
The MELSECNET/H module is
mounted with configuration not for
a PLC to PLC network normal
station.
Set the MELSECNET/H module
to a PLC to PLC network normal
station.
NETWORK PARAMETER
ERROR
(Error code: 3103)
The number of Ethernet modules
actually mounted is different from
that is set in Network parameter
for Ethernet.
Correct either the setting or
mounting status so that they
become the same.

Mitsubishi MELSEC Specifications

General

Category	Programmable Logic Controller (PLC)
Manufacturer	Mitsubishi Electric
Series	MELSEC
Programming Languages	Ladder Diagram (LD), Function Block Diagram (FBD), Structured Text (ST), Instruction List (IL), Sequential Function Chart (SFC)
Communication Protocols	Ethernet, CC-Link, RS-232, RS-485, USB, Profibus, Modbus
Model Series	FX, Q, L, iQ-R, iQ-F
Input Voltage	100-240V AC, 24V DC (varies by model)
Memory Capacity	Varies widely depending on the CPU module and series. Ranges from kilobytes to megabytes.
I/O Points	16 to 8192 points (varies by model)
Communication Ports	Ethernet, RS-232, RS-485, USB (varies by model)
Programming Software	GX Works2, GX Works3, GX Developer
Operating Temperature	0°C to 55°C
Storage Temperature	-25°C to 75°C
Humidity	5% to 95% (non-condensing)
Vibration Resistance	10 to 57Hz, 0.075mm amplitude; 57 to 150Hz, 9.8m/s² acceleration
Shock Resistance	147m/s², 3 times in each direction (X, Y, Z)
Protection Class	IP20 (varies by model)
CPU Processing Speed	0.02μs to 0.1μs per instruction (varies by model)