Led Indications - Mitsubishi Electric QJ71DN91 User Manual

5 SETUP AND PREPARATION

5.3.1 LED indications

QJ71DN91
RUN MS
NS
ERR.
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The following explains the names of the LEDs on the QJ71DN91 and their
indications in mode 0 to 8.
For the LED indications in mode 9 to C, refer to Section 5.4 Hardware Test or 5.6
Communication Test.
Table 5.1 LED names and indications
LED name Color
RUN Green
ERR. Red
MS Green
NS Green
Red
Green/Red
LED status
On: Operating normally
Off: Watchdog timer error
On: Node No. setting error
Flashing: Node No. switch or mode switch was changed during
module operation.
On: Communication is available.
Flashing: Parameter error
On: Communication in progress
Flashing: Waiting for communication (waiting for I/O
communication request from programmable controller
CPU, or waiting for communication start of the target
module)
On: Node No. duplication or bus off error (communication line
error)
Flashing: <In master function mode> A node that does not
respond exists.
<In slave function mode> Communication with the
master node is interrupted.
Off: Power to the network is not being supplied.
MELSEC-Q
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