Mitsubishi MELSEC QJ71C24, User Manual

Page: 362 / 442

11 - 46 11 - 46
MELSEC-Q
11 TROUBLESHOOTING
11.3.12 Communication error "CH1 ERR." or "CH2 ERR."
Symptom Cause Corrective action MC
Bidirectional
N
on
procedure
Pre-defined
• 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 code storage buffer memory
Address
Error cause
CH1 CH2
Name
Switch setting error
Mode switching error
203
H
Switch setting error and mode switching error status
On-demand execution error 256
H
266
H
On-demand execution result
Data transmission error 257
H
267
H
Data transmission result
Data receive error 258
H
268
H
Data reception result
Modern function error 221
H
Modern function error code
MC protocol transmission error 25A
H
26A
H
MC protocol transmission error code
Monitoring device error 2205
H
2305
H
Programmable controller CPU monitoring function execution
result
Pre-defined protocol function
error
4042
H
4052
H
Pre-defined protocol function error code
• "ERR." LED turned
on.
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".
• Set the communication protocol mode to
"Pre-defined protocol mode".
• When the pre-
defined protocol is
executed, the "ERR."
LED turns on.
• 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.