Mitsubishi MELSEC User Manual

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12.2 Troubleshooting Flowchart
12.2.10 Flowchart for when a program cannot be read
12
TROUBLESHOOTING
12.2.10 Flowchart for when a program cannot be read
The following shows the flowchart for when a program cannot be read from the CPU
module.
Figure 12.6 Flowchart for when a program cannot be read
Try resetting the CPU module.
Connect the connection cable
properly.
NO
Completed
YES
Can a program be read
by replacing the connection
cable?
Hardware error
Please consult your local Mitsubishi
service center of representative,
explaining a detailed description of
the problem.
Is the connection
cable connected
properly?
YES
NO
NO
NO
NO
YES
YES
A program cannot be read.
Can a program be read?
Can a program be read?

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)