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(2) Operation of the standby master function
The following are the operations of the master station and standby master station of when the master station
goes down.
The following figures show the operation until a failed master station goes back to normal after the standby
master station starts to operate as a master station and data link is continued.
Controlling: Controlling the data link of the CC-Link system
Standby status: Standing by in case the station controlling the data link of the CC-Link system becomes faulty.
Data link control by the master station
Master station
Controlling
Cyclic communication
Master station is down
Data link control by the standby master station
Master station
Cyclic communication
The master station in the normal state returns to the system operation. → The master station is on standby in case of the standby master
Master station
*2
Station number 0
1
Occupies 1 station
Standby
Cyclic communication
*1
When the master station goes down and the standby master station starts to take in control of data link, the station
number of the standby master station becomes 0.
*2
When the master station returns as a standby master station, the station number of the master station becomes the
number set in "Standby Master Station No." of the network parameter.
Intelligent device station
Remote device station
Station number 2
Occupies 2 stations
Cyclic communication
Intelligent device station
Remote device station
Station number 2
Occupies 2 stations
Cyclic communication
Intelligent device station
Remote device station
Station number 2
Occupies 2 stations
Cyclic communication
To the next figure
Station number 4
Occupies 1 station
Cyclic communication
Station number 4
Occupies 1 station
Cyclic communication
station failure.
Station number 4
Occupies 1 station
Cyclic communication
CHAPTER 8 FUNCTIONS
Standby master station
Station number 1
Occupies 1 station
Standby
Standby master station
Station number 1
0
*1
Controlling
Standby master station
Station number 0
Controlling
141
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