User`s manual

5
(1) LED display list
ERR.
CH2
CH1
SD
RD
NEU.
SD
NEU.
RD
RUN
QJ71C24N
ERR.
CH2
CH1
SD
RD
NEU.
SD
NEU.
RD
RUN
QJ71C24N-R2
ERR.
CH2
CH1
SD
RD
NEU.
SD
NEU.
RD
RUN
QJ71C24N-R4
Compatible protocol
CH LED
Display
contents
ON/Flickering OFF
MC
Non-
procedural
Bidirectional
RUN
Normal
operation
display
Normal Faulty or reset
-
ERR
Error display
(*1)
Error has
occurred
Normal
Valid
NEU
(*3)
Neutral status
on the CH1 side
display (*2)
Waiting for MC
command
message to be
received
MC command
message being
received
Valid Invalid (OFF)
SD
Transmission
status display
Data being
transmitted
Data not
transmitted
CH1
RD
Reception
status display
Data being
received
Data not
received
Valid
NEU
(*3)
Neutral status
on the CH2 side
display (*2)
Waiting for MC
command
message to be
received
MC command
message being
received
Valid Invalid (OFF)
SD
Transmission
status display
Data being
transmitted
MC command
message not
transmitted
CH2
RD
Reception
status display
Data being
received
MC command
message not
received
Valid
1: This LED turns ON when an error occurs at serial communication
module hardware or during data communication.
2: This LED displays the data communication status via MC protocol.
On: Waiting for the command message to be received from the
external device.
Off: Processing the command message received from the external
device.
3: This LED can be made valid also when "GX Developer connection"
(0
H
) is specified in communication protocol setting.