Mitsubishi MELSEC Q Series User Manual page 78

4 FUNCTIONS
Controlling: Controlling the data link of the CC-Link system
Standby: 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
Master station
Cyclic communication
Master station returns to normal mode and system operation
Master station
Station number 0
Standby
Cyclic communication
1: When the master station becomes faulty and the data link control is transferred to the standby master station,
the station number of the standby master station becomes "0".
2: When the master station returns to system operation as a standby master station, the station number of the master
station becomes the one specified in the "Standby master station number" in the network parameters.
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Remote device station
Station number 2
Number of occupied stations: 2
Data link control by the standby master station
Remote device station
Station number 2
Number of occupied stations: 2
2
1 Number of occupied stations: 1
Remote device station
Station number 2
Number of occupied stations: 2
Intelligent device station
Station number 4
Number of occupied stations: 1
Cyclic communication
Intelligent device station
Station number 4
Number of occupied stations: 1
Cyclic communication
Master station prepares itself for standby master station system down
Intelligent device station
Station number 4
Number of occupied stations: 1
Cyclic communication
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MELSEC-Q
Standby master station
Station number 1
Number of occupied stations: 1
Standby
Cyclic communication
Standby master station
Station number 1
Controlling
Cyclic communication
Standby master station
Station number 0
Controlling
Cyclic communication
1
0
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