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MELSEC-Q
11 TROUBLESHOOTING
11.2.13 Flowchart for when unable to read a program
The following shows the flowchart to be followed when communication with
GX Developer cannot be made during PLC power-on.
The CPU cannot communicate
with the GX Developer.
Is the memory to be
read correct?
Select the correct memory.
Can the CPU communicate
with the GX Developer?
Is the connection cable
connected properly?
Connect the connection cable properly.
Can the CPU communicate
with the GX Developer?
Completion
NO
YES
NO YES
YES
NO YES
NO
YES
YES
NO
USB
Is the connection type RS-232?
RS-232
YES
Is the USB driver
installed in the personal
computer?
NO
Install the USB driver into the
personal computer.
NO
YES
Can the CPU
communicate with GX Developer by
lowering the baud rate?
NO
Can the CPU communicate
with the GX Developer?
Can the CPU
communicate with the
GX Developer by replacing the
connection cable?
Please consult your local Mitsubishi
service center or representative,
explaining a detailed description
of the problem.
Please consult your local Mitsubishi
service center or representative,
explaining a detailed description
of the problem.