R7C-DC8E
P. / 5
EM-780-AG
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STATUS INDICATOR LED
PWR RUN ERR
SD
RD
STATUS
ON
ON
FL
FL
ON Communicates normally with occasional CRC errors due to noise interference.
ON
ON
FL
FL
ON Communicates normally but the Baud Rate and/or Station Address switches failed.
ERR LED flashes approximately in 0.5 second intervals.
ON
ON
FL
FL
OFF ----
ON
ON
FL
OFF ON CRC error found in the received data. Unable to respond.
ON
ON
FL
OFF OFF ----
ON
ON OFF
FL
ON Normal communication
ON
ON OFF
FL
OFF ----
ON
ON OFF OFF ON Unable to receive data addressed to the station.
ON
ON OFF OFF OFF ----
ON OFF
FL
FL
ON Performs the interval-timed responses but CRC error found in receiving the refresh
data.
ON OFF
FL
FL
OFF ----
ON OFF
FL
OFF ON CRC error found in the data addressed to the station.
ON OFF
FL
OFF OFF ----
ON OFF OFF
FL
ON Link is not started.
ON OFF OFF
FL
OFF ----
ON OFF OFF OFF ON No data addressed to the station. Or unable to receive data addressed to the station
due to noise interference. (Missing parts of the data sent from the master)
ON OFF OFF OFF OFF Unable to receive data due to wire breakdown
ON OFF ON OFF ON/OFF Faulty Baud Rate and/or Station Address setting
OFF OFF OFF OFF OFF Power input removed. Or power supply failure.
OFF = OFF, ON = ON, FL = Flashing
---- = Inconceivable in normal operations (e.g. LED failure)
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DISCRETE I/O STATUS INDICATOR LED
Discrete I/O modules including those for extensions have LED indicators showing I/O signal status.
Contact ON : LED ON
Contact OFF : LED OFF
INDICATOR LED
