Communication Error "Ch1 Err." Or "Ch2 Err - Mitsubishi Electric QJ71C24N User Manual

11 TROUBLESHOOTING

11.3.12 Communication error "CH1 ERR." or "CH2 ERR."

Symptom
• "ERR." LED turned
on.
• When the pre-
defined protocol is
executed, the "ERR."
LED turns on.
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Cause
• 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, an error code is stored in the following buffer memory.
Error cause
Switch setting error
Mode switching error
On-demand execution error
Data transmission error
Data receive error
Modern function error
MC protocol transmission error
Monitoring device error
Pre-defined protocol function
error
See Section 11.2 for a detailed description of the error codes.
• The communication
protocol mode is set to
other than "Pre-defined
protocol mode".
• No protocol setting data
have been written to the Q
series C24.
Corrective action
• 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.
Error code storage buffer memory
Address
CH1 CH2
203 Switch setting error and mode switching error status
H
256 266 On-demand execution result
H H
257 267 Data transmission result
H H
258 268 Data reception result
H H
221 Modern function error code
H
25A 26A MC protocol transmission error code
H H
Programmable controller CPU monitoring function execution
2205 2305
H H
result
4042 4052 Pre-defined protocol function error code
H H
• Set the communication protocol mode to
"Pre-defined protocol mode".
* Write the protocol setting data from GX
Configurator-SC (Pre-defined protocol
support function) and then execute the
CPRTCL instruction.
MELSEC-Q
Name
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