Mitsubishi Electric QJ71C24N User Manual page 107

4 SETTINGS AND PROCEDURES PRIOR TO OPERATION
QJ71C24N
RUN
NEU.
SD
CH1
RD
CH LED Display contents
RUN Normal operation display
—
ERR Error display (
NEU Neutral status on the CH1
( 3) side display (
CH1 Transmission status
SD
display
RD Reception status display
NEU Neutral status on the CH2
( 3) side display (
Transmission status
CH2 SD
display
RD Reception status display
4 - 4
(1) LED display list
QJ71C24N-R2
ERR.
NEU.
SD CH2
CH1
RD
On/flashing
Normal
1) Error has occurred
Waiting for MC command
2) message to be received
Data being transmitted
Data being received
Waiting for MC command
2) message to be received
Data being transmitted
Data being received
1 This LED comes on when an error occurs at Q series C24 hardware or during data communication.
2 This LED displays the data communication status via MC protocol. (See chapter 11.)
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" (0H) is specified in communication
protocol setting.
RUN ERR.
NEU. NEU.
SD SD CH2
RD RD
Off
Faulty or reset
Normal
MC command message
being received
Data not transmitted
Data not received
MC command message
being received
MC command message
not transmitted
MC command message
not received
MELSEC-Q
QJ71C24N-R4
RUN ERR.
NEU. NEU.
SD SD CH2
CH1
RD RD
Compatible protocol
Non-
MC Bidirectional
procedural
Valid
Valid Invalid (Off)
Valid
Valid Invalid (Off)
Valid
Pre-
defined
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