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CC-Link communication status indication list
○: Lit ●: Unlit ◎: Flashing
RUN
(Green)
ERR
(Red)
SD
(Green)
RD
(Green)
Operation
○ ◎ ◎ ○
Communication is normally performed, however, CRC(*) error
frequently occurs due to noise.
○ 0.4s◎ ◎ ○
Baud rate or station No. has changed from baud rate for reset
release or station No. setting.
○ ◎ ◎ ●
(Impossible status)
○ ◎ ● ○
Received data became CRC(*) error, and cannot respond.
○ ◎ ● ●
(Impossible status)
○ ● ◎ ○
Normal communication
○ ● ◎ ●
(Impossible status)
○ ● ● ○
No data is transmitted to local station.
○ ● ● ●
(Impossible status)
● ◎ ◎ ○
Polling response is performed, but refresh reception is CRC(*) error.
● ◎ ◎ ●
(Impossible status)
● ◎ ● ○
Data to local station is CRC(*) error
● ◎ ● ●
(Impossible status)
● ● ◎ ○
Not link-started.
● ● ◎ ●
(Impossible status)
● ● ● ○
There is no data to local station, or reception for local station is
impossible due to noise.
● ● ● ●
Data cannot be received due to disconnection. Power is shut off or
H/W is being set.
● ○ ● ○
Invalid baud rate, invalid station No. setting
● ○ ● ●
Invalid baud rate, invalid station No. setting
● ● ● ●
Power is shut off, or remote station power part is in fault.
*CRC: Cyclic Redundancy Check
Data error detecting method which is mostly used for synchronizing transmission
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