• Read the error code from the buffer memory and check the error contents and change the switch setting to the correct setting.
• Read the error code from the buffer memory and check the error contents and correct the designation contents.
• Read the error code from the buffer memory and check the error contents and correct the designation contents.
• Read the error code from the buffer memory and take the corrective action corresponding to the error contents.
• Read the error code from the buffer memory and take the corrective action corresponding to the error contents.

10 TROUBLESHOOTING

MELSEC-Q

10.3.10 Troubleshooting when communication error "CH1 ERR.", "CH2 ERR." generate

Symptom

• "ERR." LED turned on.

Cause

Corrective action

MC

Bidirectional Non procedure

 

 

 

• There is an error in the communication protocol or transmission setting.

• There is an error in the on-line mode switching designation.

• On-demand execution generated an error.

• The Q series C24 detected an error while transmitting data.

• The Q series C24 detected an error while receiving data.

Note

• When the "ERR." LED is turned on, the error code is stored to the following buffer memory.

 

 

 

 

Error code storage buffer memory

 

Error cause

 

Address

 

Name

 

 

 

 

 

 

 

 

CH1

 

CH2

 

 

 

 

 

 

 

 

 

 

 

 

 

Switch setting error

 

203H

 

Switch setting error, mode switching error storage area

 

Mode switching error

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

On-demand execution

256H

 

266H

 

On-demand execution result storage area

error

 

 

 

 

 

 

 

 

Data transmission error

257H

 

267H

 

Data transmission result storage area

 

 

 

 

 

 

Data receive error

258H

 

268H

 

Data receive result storage area

Modern function error

 

221H

 

Modern function error code storage area

 

 

 

 

 

 

 

MC protocol

025AH

 

026AH

 

MC protocol transmission error code

transmission error

 

 

 

 

 

 

 

 

Monitoring device error

2205H

 

2305H

 

PLC CPU monitoring function execution result

 

 

 

 

 

 

 

See Section 10.2 for a detailed description of the error codes.

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