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MELSEC-Q
4 SETTING AND PROCEDURE BEFORE OPERATION
4.2.2 QJ72LP25-25, QJ72LP25G, QJ72LP25GE, QJ72BR15
(1) QJ72LP25-25, QJ72LP25G, QJ72LP25GE
(a) LED indications
No. Name LED status Description
1 RUN ON (green)
Normal operation
OFF
Watchdog timer error (hardware failure)
2
REM.
1
ON (green)
Normal operation
Flashing
(green)
Parameters being written to the flash ROM or in device test mode
OFF
Being initialized remotely or error (watchdog timer error, fuse blown error, I/O module verify error,
or other errors)
3 T.PASS ON (green)
In the baton pass status (The module is connected to the network.)
Flashing
(green)
Being tested (When the LED flashes 20 times or more (approx. 10 seconds), it means the end of
the test.)
OFF
Not in the baton pass status (The host station has been disconnected from the network.)
4 D.LINK ON (green)
Data link being performed (Cyclic transmission is being performed.)
OFF
Data link not being performed (Parameters have not been received, an error has occurred in the
CPU module of host station, a data link stop instruction has been issued, or others.)
5 SD ON (green)
Data being sent
OFF
Data not being sent
6 RD ON (green)
Data being received
OFF
Data not being received