Mitsubishi Electric 800 Series Instruction Manual page 98

LED status
RUN L.RUN SD
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● ● ○
● ● ○
● ● ○
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● ○
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● ○
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● ○ 
● ○ ○
● ○ ○
● ○ ○
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● ●
○ ○ ○
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− −
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●: ON, ○: OFF, : Flicker
RD L.ERR
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Normal communication is made but CRC error has occurred due to noise.
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○ Normal communication
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○ Hardware fault
○ ○ Hardware fault
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Cannot answer due to CRC error of receive data.
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○ Data sent to the host station does not reach destination.
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○ Hardware fault
○ ○ Hardware fault
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Polling response is made but refresh receive is in CRC error.
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○ Hardware fault
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○ Hardware fault
○ ○ Hardware fault
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Data sent to the host station is in CRC error.
There is no data sent to the host station, or data sent to the host station cannot be
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received due to noise.
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○ Hardware fault
○ ○ Cannot receive data due to break in the cable, etc.
○
● Invalid baud rate or station number setting
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Baud rate or station number changed during operation.
○ ○ Watchdog fault (hardware fault), power disconnection, faulty power supply area
Master station is connected to CC-Link ver. 1 and FR-A8NC is connected to CC-Link
− −
ver. 2.
Cause
HOW TO CHECK FOR ERROR USING THE LEDS
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