Mitsubishi MELSEC LJ71C24, User Manual

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15 TROUBLESHOOTING
15.4 Initializing Error Information of the Serial Communication Module
This section explains the ERR. LED ON factors and the error code initialization (clear)
for the C24.
(1) ERR. LED ON factors
When any of the following errors occurs, its error code is stored in the buffer
memory corresponding to the interface (CH) where the error occurred, and the
ERR. LED turns on.
Error code storage buffer memory Applicable protocol
Address
Error cause
CH1 CH2
Name MC
Non-
procedural
Bidirectional
Pre-
defined
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 reception error 258
H
268
H
Data reception result
MC protocol transmission error 025A
H
026A
H
MC protocol transmission error code
Monitoring device error 2205
H
2305
H
Programmable controller CPU monitoring
function execution result
Predefined protocol function error 4042
H
4052
H
Predefined protocol function error code
(2) Turning off the ERR. LED and initializing the error codes by GX
Works2
(a) When turning off the ERR. LED and initializing the error codes
By turning on the CH ERR. clear request in the "Intelligent Function
Module Monitor" screen, the ERR. LED of the C24 turns off and the stored
error codes are initialized.
(b) When initializing the communication error information
By making the CH LED off, Communication error clear request on the
"Intelligent Function Module Monitor" screen, the LEDs (ERR., NEU.) of the
C24 turn off and the communication error information is initialized.
(3) Turning off the ERR. LED and initializing the error codes by
sequence program
(a) Input signals used to notify of error occurrences and output signals used to
initialize the error code
I/O signal Name of status information Description/function
XE CH1 ERR. occurrence Turns on upon error occurrence in CH1 interface.
Input signal
XF CH2 ERR. occurrence Turns on upon error occurrence in CH2 interface.
YE CH1 ERR. clear request Turns on when initializing error code of interface on CH1 side.
Output signal
YF CH2 ERR. clear request Turns on when initializing error code of interface on CH2 side.
Initialization of error code is continuously performed when ERR. clear request
(YE/YF) is on.
POINT
The CHn side error information can be initialized by the LED off, Communication
error clear request (address: 0
H
/1
H
). By using the ERR. clear request (YE/YF), the
error codes stored in the above buffer memory can further be initialized (cleared).
However, protocol execution logs are not cleared even if the ERR. clear request
(YE/YF) is used.