Troubleshooting - Mitsubishi Electric A173UHCPU User Manual

5. INSPECTION AND MAINTENANCE

5.4 Troubleshooting

This section describes the errors which could occur when using the system and
what to do about them.
Refer to the appropriate software package operating manual for information on the
error messages displayed during peripheral device operation.
When an error occurs, the system status can be determined by checking the
equipment where the error occurred, from the error codes, or by monitoring with a
peripheral device. To quickly recover from an error, use the appropriate method to
determine the cause of the error.
Error occurs
(1) Checking the equipment where the error occurred
Visually determine the cause of the error from the indicators on the front of the
module, from the operating status of the equipment, etc.
(a) Machine motion (stop status, operating status)
(b) Whether power is on or off
(c) Status of I/O equipment
(d) Wiring status (I/O wires, cables)
(e) Display states of various indicators (e.g. POWER LED, RUN LED, ERROR
LED, I/O LED)
(f) Setting states of various setting switches (e.g. extension base, power failure
compensation)
After checking (a) to (f), connect the peripheral device and check the CPU
module's operating status and program data.
(2) Checking the error codes
Determine the cause of the error by monitoring the error codes stored when the
error occurred.
The error code storage devices are listed below.
Refer to the appropriate operating system programming manual for
descriptions of the error codes.
(a) Error codes during sequence control
Refer to Section 5.4.1 (10) "Table of Error Codes" for descriptions of the
error codes.
Error code
(b) Error codes during motion control
For error storage devices in motion control, refer to the programming manual of
the corresponding OS.
Check the equipment where the error occurred
Check from the error code
Check by monitoring from a peripheral device
D9008
5 − 7