Mitsubishi Electric Q06HCPU - Errors Caused by Hardware

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15.3.3 Errors caused by hardware
(1) UNIT VERIFY ERR. has occurred
If UNIT VERIFY ERR. has occurred, check the following items.
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.
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.
Check item Corrective action
The module was attached or detached during operation, or
improperly mounted.
Mount the module properly and reset the CPU module.
When the extension base unit is used, the extension cable is
improperly connected.
Connect the extension cable properly and reset the CPU
module.
Check item Corrective action
The module is improperly mounted. Mount the module properly and reset the CPU module.
When the extension base unit is used, the extension
cable is improperly connected.
Connect the extension cable properly and reset the CPU module.
Noise affects the module.
Take noise reduction measures. (
Page 651, Appendix 8)