Transmission From An External Device; Operating Status Of The Cpu Module - Mitsubishi Electric Q26UD(E)HCPU User Manual

15.3.8

Transmission from an external device

If no response is returned from an external device, check the following items.
More than one external device is communicating with the
CPU module.
The data logging function is used.
If communication cannot be performed even after taking the above actions, the possible cause is a hardware failure.
Please consult your local Mitsubishi representative.
15.3.9

Operating status of the CPU module

If it takes time for the CPU module to switch the operating status, check the following items.
The data logging function is used.
If communication cannot be performed even after taking the above actions, the possible cause is a hardware failure.
Please consult your local Mitsubishi representative.
Check item
Check item
CHAPTER 15 TROUBLESHOOTING
Corrective action
• Adjust the service processing time in parameter.
• Adjust the value of communication time check period or
number of retries.
• Check the condition of the cables, connected device
(personal computer), and CPU module.
Refer to the troubleshooting section of the following manual.
QnUDVCPU/LCPU User's Manual (Data Logging
Function)
Corrective action
Refer to the troubleshooting section of the following manual.
QnUDVCPU/LCPU User's Manual (Data Logging
Function)
15
297