Mitsubishi Electric QJ71C24N-R4 - Communication Error CH1 ERR. or CH2 ERR

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MELSEC-Q
11 TROUBLESHOOTING
11.3.12 Communication error "CH1 ERR." or "CH2 ERR."
Symptom Cause Corrective action
MC
Bidirectional
Non
p
rocedure
Pre-defined
• "ERR." LED turned
on.
• There is an error in the
communication protocol or
transmission setting.
• Read the error code from the buffer memory
and check the error contents and change
the switch setting to the correct setting.
• There is an error in the on-
line mode switching
designation.
• Read the error code from the buffer memory
and check the error contents and correct the
designation contents.
• On-demand execution
generated an error.
• Read the error code from the buffer memory
and check the error contents and correct the
designation contents.
• The Q series C24
detected an error while
transmitting data.
• Read the error code from the buffer memory
and take the corrective action corresponding
to the error contents.
• The Q series C24
detected an error while
receiving data.
• Read the error code from the buffer memory
and take the corrective action corresponding
to the error contents.
Note
• When the "ERR." LED is turned on, an error code is stored in the following buffer memory.
Error cause
Error code storage buffer memory
Address
Name
CH1 CH2
Switch setting error
203
H Switch setting error and mode switching error status
Mode switching error
On-demand execution error 256H 266H On-demand execution result
Data transmission error 257H 267H Data transmission result
Data receive error 258H 268H Data reception result
Modern function error 221H Modern function error code
MC protocol transmission error 25AH 26AH MC protocol transmission error code
Monitoring device error 2205
H 2305H
Programmable controller CPU monitoring function execution
result
Pre-defined protocol function
error
4042
H 4052H Pre-defined protocol function error code
See Section 11.2 for a detailed description of the error codes.
• When the pre-
defined protocol is
executed, the "ERR."
LED turns on.
• The communication
protocol mode is set to
other than "Pre-defined
protocol mode".
• Set the communication protocol mode to
"Pre-defined protocol mode".
• No protocol setting data
have been written to the Q
series C24.
* Write the protocol setting data from GX
Configurator-SC (Pre-defined protocol
support function) and then execute the
CPRTCL instruction.