User`s manual

Troubleshooting Troubleshooting
MELSEC System Q, Hardware 11 – 23
11.2.23 When the CPU cannot communicate with GX Developer/GX IEC Developer
The CPU cannot communicate
with programming device.
Please consult your local Mit-
subishi service center or rep-
resentative.
YES
NO
YES
NO
YES
NO
Completed
YES
Which connection
type is used?
NO
USB
Is the connection cable
connected properly?
Connect the connection cable
properly.
Communication
enabled?
YES
Can the CPU
communicate after
replacing the connection
cable?
RS232
Is the USB driver
installed in the personal
computer?
Install the USB driver into the per-
sonal computer.
YES
NO
Please consult your local Mit-
subishi service center or rep-
resentative.
Can the CPU
communicate by lowering
the baud rate?
Replace the
CPU module;
Communication enabled?
YES
Replace the replaced CPU mod-
ule with the original CPU module
and check to see if the CPU mod-
ule starts up normally.
NO
(To next page)
Communication
enabled?