Program Example For Use Of Sequence Program - Mitsubishi Electric QJ71MT91 User Manual

11 TROUBLESHOOTING

11.4.2 Program example for use of sequence program

COM.ERR. Module
LED OFF READY
command
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This section explains how to turn off the COM. ERR. LED from a sequence program.
(1) Relationship between COM.ERR. LED and I/O signals
Upon occurrence of a communication error, the COM.ERR. LED (COM.ERR.
LED status (X1B): ON) on the front of the QJ71MT91 turns ON. (1) in the figure)
(a) Turn ON the COM.ERR. LED OFF request (Y1B) to turn OFF the
COM.ERR. LED. (2) in the figure)
COM.ERR. LED OFF request (Y1B)
COM.ERR. LED status (X1B)
(b) While the COM.ERR. LED OFF request (Y1B) is ON, OFF request
processing is performed continuously. (3) in the figure)
(c) The error information in the error log area of the buffer memory is not
cleared (erased) by turning ON the COM.ERR. LED OFF request (Y1B).
(2) Program conditions
In this program, COM. ERR. LED OFF request (Y1B) is turned on to turn off the
COM. ERR. LED.
Device Name
QJ71MT91 input/output
External input (command)
(3) Program example
COM.ERR.
LED status
COM.ERR.
LED status
Error
Error occurrence
occurrence
Device
X0
Input
X1B
Output Y1B
X20
MELSEC-Q
(LED OFF)
(LED ON)
1) 2) 3)
ON
Error
occurrence
Application
Module READY
COM. ERR. LED status
COM. ERR. LED OFF request
COM. ERR. LED OFF command
COM.ERR. LED
COM.ERR. OFF request
LED OFF
request
COM.ERR. LED
COM.ERR. OFF completed
LED OFF
request
(LED ON)
1)
ON
Error
occurrence
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