Mitsubishi Electric Q81BD-J61BT11 User Manual page 30

1 OVERVIEW
Master
station
Master
station
1 - 6
(5) System down prevention (Slave station disconnect function)
Even if a module system fails because of power failure or power off, it will not
affect the communication with other normal modules since the system employs
the bus connection method.
Also, for a module using a 2-piece terminal block, the module can be replaced
during data link. (Replace the module after turning its power off. Also check that
the switch setting on the replaced module is same as the one set on the module
before replacement.) However, if the cable is disconnected, the data link to all
stations is disabled.
Station number 1
Remote station
(occupying
2 stations)
Faulty
station
Station number 1
Remote station
(occupying
2 stations)
(6) Auto return function
When a module that has been disconnected from the link due to power off
recovers and returns to the normal status, it will join the data link automatically.
(7) Input data status setting from a data-link faulty station
The data entered (received) from a data-link faulty station can be cleared, or the
status immediately before the error can be restored.
Station number 4
Local station
(occupying
Station number 3
1 station)
Remote station
(occupying
1 station)
Data link continues
Station number 4
Local station
(occupying
Station number 3
1 station)
Remote station
(occupying
1 station)
MELSEC
Station number 7
Local station
(occupying
Station number 5
4 stations)
Remote station
(occupying
2 stations)
Station number 7
Local station
(occupying
Station number 5
4 stations)
Remote station
(occupying
2 stations)
1 - 6