Mitsubishi MELSEC LJ71C24, User Manual

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15 TROUBLESHOOTING
• Intelligent Module Information
The status of the C24 when the error, which is currently selected
under "Error History List", had occurred is displayed.
For the C24, the following will be displayed.
Item Description
Channel where error occurs Channel on which an error has occurred.
LED ON status, communication error
status
Communication error and LED ON status of the
channel on which an error has occurred.
(Value of the buffer memory address 201
H
/202
H
is
displayed.)
Communication protocol status
Communication protocol status at the occurrence of
the error.
(Value of the buffer memory address 252
H
/262
H
is
displayed.)
Transmission status
Transmission status at the occurrence of the error.
(Value of the buffer memory address 253
H
/263
H
is
displayed.)
Control signal status
RS-232 control signal status at the occurrence of
the error.
(Value of the buffer memory address 254
H
/264
H
is
displayed.)
MC protocol transmission sequence
status
Transmission sequence status at the occurrence of
the error.
(Value of the buffer memory address 255
H
/265
H
is
displayed.)
Nonprocedural protocol Receive user
frame
Receive user frame at the occurrence of the error.
(Value of the buffer memory address 25B
H
/26B
H
is
displayed.)
Predefined protocol Execution status
Protocol execution status at the occurrence of the
error.
(Value of the buffer memory address 4041
H
/4051
H
is displayed.)
Predefined protocol Number of protocol
executions
Protocol No. at the occurrence of the error.
(Value of the buffer memory address 4103
H
/4803
H
is displayed.)