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MELSEC
4 FUNCTIONS
4.3.4 Continuing the data link even when the master station is faulty
(standby master function)
This function enables the data link to continue by switching a faulty master station to a
standby master station (i.e. a backup station for the master station).
Note that, even if the master station has been restored, automatic switching from the
standby master station to the master station is not performed.
Data link control
by the master station
Master station
Remote I/O station
Station number 2
Number of occupied stations: 1
Remote I/O station
Station number 3
Number of occupied stations: 1
Standby master station
Station number 1
Number of occupied stations: 1
Data link control
in progress
Standby
Cyclic communication
Cyclic communication
Cyclic communication
Master station is down Data link control by the standby master station
Master station
Remote I/O station
Station number 2
Number of occupied stations: 1
Remote I/O station
Station number 3
Number of occupied stations: 1
Standby master station
Station number: 1 0
Control in
Progress
Cyclic communication
Cyclic communication
Cyclic communication
In this section, the above system configuration will be used in the explanation.
POINT
Refer to "Section 2.2 (1)" for the combinations when using the CC-Link Ver.2 board
as the standby master station.
Summary of Contents for Q80BD-J61BT11N
Page 2: ......
Page 34: ...1 10 1 10 MELSEC 1 OVERVIEW MEMO ...
Page 54: ...3 12 3 12 MELSEC 3 SPECIFICATIONS MEMO ...
Page 124: ...5 16 5 16 MELSEC 5 PROCEDURE BEFORE STARTING THE DATA LINK MEMO ...
Page 160: ...9 2 9 2 MELSEC 9 MELSEC DATA LINK LIBRARY MEMO 9 ...
Page 200: ...12 16 12 16 MELSEC 12 COMMUNICATION BETWEEN THE MASTER STATION AND LOCAL STATIONS MEMO ...
Page 355: ...App 93 App 93 MELSEC APPENDIX MEMO ...
Page 361: ......