Mitsubishi Electric FR-A8NCE Instruction Manual page 9

 Operation status LEDs
LED name
RUN Operation status
SD Transmission status
RD Reception status
D LINK Cyclic communication status
ERR Node failure status
L.ERR Link error

Also lit in no-communication state.

This LED indicates a communication break between the master station and FR-A8NCE (due to cable disconnection or breakage, power-
OFF of the master power supply, or reset, etc.)
8
PRE-OPERATION INSTRUCTIONS
RUN
SD
RD
Description
Normal operation (normal 5 V internal
voltage)
Data transmitting
Data receiving
Cyclic transmitting
Node failure

Received data error
D LINK
ERR
L.ERR
ON

OFF
Hardware failure
No data transmitting
No data receiving
No cyclic transmitting or disconnected
Normal operation
Received data normal