Errors Caused By Hardware - Mitsubishi Electric Q26UD(E)HCPU User Manual

15.3.3

Errors caused by hardware

(1) UNIT VERIFY ERR. has occurred
If UNIT VERIFY ERR. has occurred, check the following items.
The module was attached or detached during operation, or
improperly mounted.
When the extension base unit is used, the extension cable is
improperly connected.
If UNIT VERIFY ERR. occurs even after taking the above actions, perform the following actions sequentially for
recovery to normal operation.
• Check the target slot No. in the common information (SD5) of the error code, and replace the corresponding
module.
• Replace the CPU module.
• Replace the base unit.
If UNIT VERIFY ERR. occurs even after taking the above actions, the possible cause is a hardware failure.
Please consult your local Mitsubishi representative.
(2) CONTROL BUS ERR. has occurred
If CONTROL BUS ERR. has occurred, check the following items.
The module is improperly mounted.
When the extension base unit is used, the extension
cable is improperly connected.
Noise affects the module.
If CONTROL BUS ERR. occurs even after taking the above actions, perform the following actions sequentially for
recovery to normal operation.
• Check the target slot No. in the common information (SD5) of the error code, and replace the corresponding
module.
• Replace the CPU module.
• Replace the base unit.
If CONTROL BUS ERR. occurs even after taking the above actions, the possible cause is a hardware failure.
Please consult your local Mitsubishi representative.
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Check item
Check item
Corrective action
Mount the module properly and reset the CPU module.
Connect the extension cable properly and reset the CPU
module.
Corrective action
Mount the module properly and reset the CPU module.
Connect the extension cable properly and reset the CPU module.
Take noise reduction measures. ( Page 651, Appendix 8)