Mitsubishi MELSEC User Manual

12 - 8
12.2 Troubleshooting Flowchart
12.2.4 When the "ALIVE" LED does not turn on or turns off
12
TROUBLESHOOTING
(2) When the "ALIVE" LED of the CPU module turns off during operation of the
programmable controller
The "ALIVE" LED of the CPU module may turn off in the following cases.
(a) When the CPU module detects the hardware failure.
When the power supply module, CPU module, CC-Link Safety master module,
and network module are mounted to/removed from the base unit while the power
is ON. In this case, the CPU module detects a "POWER SUPPLY ERROR"
(error code: 8080).
When the "ALIVE" LED turns off, the CPU module forcibly goes into the stop status.
In this case, the communications with GX Developer cannot be guaranteed. Turn on the
power supply again or reset the CPU module with RUN/STOP/RESET switch.
If the problem is not improved after performing the operation above, please consult your
local Mitsubishi service center or representative, explaining a detailed description of the
problem.

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)