Mitsubishi Electric Q81BD-J61BT11 User Manual page 258

16 TROUBLESHOOTING
1) 2)
Is the "L RUN" LED lit?
YES
Is the "SD" LED lit?
YES
16 - 24
NO
Is the "SD" LED lit (flashing)?
NO
Corresponding module failure
Are the station No.
switches set correctly?
(Isnt the station No.
duplicated?)
Corresponding module failure
(Station No. switch)
1: Check for short circuits, reversed connections, disconnections, terminal resistors, FG
connections, overall distance, and distance between stations.
NO
YES
NO
YES
Corresponding module failure
(Transmission speed switch)
Set the correct station No.
Reset the
Q80BD-J61BT11N/Q81BD-J61BT11.
Complete
NO
Is the transmission rate
set correctly?
YES
Set the correct transmission rate
Reset the
Q80BD-J61BT11N/Q81BD-J61BT11
Is the
NO
communication cable wired
correctly?
1
YES
Wire the communication cable correctly
MELSEC
3)
16 - 24