Flowchart For When Control Bus Err. Occurs - Mitsubishi Q01CPU User Manual

12
TROUBLESHOOTING

12.2.20 Flowchart for when CONTROL BUS ERR. occurs

The following shows the flowchart for when CONTROL BUS ERR. occurs at programmable
controller power-on or during operation.
This flow chart can be confirmed only when a specific slot/base unit can be detected by the
error code.
Check the slot base unit where error
occurred with the GX Developer.
properly? Is the extension cable of the
Hardware fault
Please consult your local Mitsubishi Please consult your local nearest
service center or representative,
Mitsubishi or representative,
explaining a detailed description of
explaining a detailed description of
the problem. the problem.
The CONTROL BUS ERR.
has occured.
Is the module of
the applicable slot mounted
applicable base unit connected
properly?
YES
Are all the
extension cables of the
base unit connected
properly?
YES
Has
noise in excess of
the specified value been
generated?
NO
Replace the
corresponding module.
Error detection
Replace the CPU
module.
Error detection
Replace the
applicable base unit.
Error detection
Diagram 12.17 Flowchart for when CONTROL BUS ERR. occurs
12.2.20 Flowchart for when CONTROL BUS ERR. occurs
Mount the module and extension
NO
cable properly.
NO
Is the "ERR." LED
turned off?
NO
Connect the extension cable properly.
NO
Is the "ERR." LED
turned off?
YES
Take measures against noise.
Normal operation
Normal operation
Normal operation
12.2 Troubleshooting
9
10
11
12
YES
YES
Complete
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