Mitsubishi Melsec-Q Series User Manual page 334

12.2.30 When the CPU cannot communicate with GX Developer
Refer to the following flowchart when communication with peripheral device is disabled when connecting the CPU
module with GX Developer.
The CPU cannot communicate
with the GX Developer.
Is the connection cable
connected properly?
YES
Can the CPU
communicate with the GX
Developer by replacing the
connection cable?
NO
Replace the
CPU module with
another one and check to see
if communication can be made
between the replaced CPU
module and GX
Developer.
NO
Is the connection
type RS-232?
RS-232
Can the CPU
communicate with GX
Developer by lowering the
baud rate?
NO
Please consult your local nearest
Mitsubishi or representative,
explaining a detailed description of
the problem.
12 - 39
NO
YES
YES
Is the USB driver
USB
installed in the personal
computer?
YES
Please consult your local nearest
Mitsubishi or representative,
explaining a detailed description of
the problem.
YES
Connect the connection cable
properly.
Can the CPU
NO
communicate with the GX
Developer?
Replace the replaced CPU module
with the original CPU module and
check to see if the CPU module
starts up normally.
(To next page)
NO
Install the USB driver into
the personal computer.
Can the CPU
NO
communicate with the GX
Developer?
Completed
YES
YES