LC-42/46/52D64U
6 – 21
3) Communication failure details (Power LED flashes 3 times and OPC LED flashes)
Error type Notification LED operation (1 cycle)
Basically, communication logs are analyzed by a bus
monitor or debug print logs are analyzed.
Initial communication
reception failure
Flashes once
Initial communication from the main CPU is not received.
(After canceling the reset, request for the monitor model No.
is not received.)
Communication line failure or main CPU start-up failure.
Time-out setting reception failure
Start-up confirmation reception failure
Flashes twice
Time-out setting and start-up mode change cannot be
received from the main CPU. (Start-up communication until
time-out setting and start-up mode change is not received.)
Main CPU start-up failure or monitor microprocessor’s recep-
tion failure.
Regular communication failure
Flashes 3 times
Regular communication that is performed at 1 second inter-
vals in the normal operation is interrupted.
Main CPU operation failure or monitor microprocessor’s
reception failure.
H: On
L: Off
H: On
L: Off
H: On
L: Off
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