Mitsubishi Melsec-L Series User Manual page 28

2
CH LED Description
RUN Normal operation
—
ERR. Error ( 1)
NEU. Neutral status on the
( 3) CH1 side ( 2)
CH1
SD Transmission status
RD Reception status
NEU. Neutral status on the
( 3) CH2 side ( 2)
CH2
SD Transmission status
RD Reception status
2 - 2
(1) Indicator LED
On Flashing
Normal
Error has occurred
Waiting for MC
protocol command
message to be
received
Data being transmitted
Data being received
Waiting for MC
protocol command
message to be
received
Data being transmitted
Data being received
1 This LED turns on when an error occurs at C24 hardware or during data communication. (Refer to
chapter 15.)
2 This LED displays the data communication status via the 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 is also valid when "MELSOFT Connection" is specified in communication protocol setting.
Off
MC
— Faulty or reset
— Normal
MC protocol
— command message Valid
being processed
Data not transmitted
Data not received
MC protocol
— command message Valid
being processed
MC command
message not
transmitted
MC command
message not
received
2 PART NAMES
Applicable protocol
Non- Pre-
Bidirectional
procedural defined
Valid
Invalid (Off)
Valid
Invalid (Off)
Valid
2 - 2