Mitsubishi Electric Q Series Reference Manual page 341

7 APPLICATION FUNCTIONS
[When station No. 1 is returned to the system]
When station No. 1 separated due to a communication error is returned to the system, the redundant CPU installed with the
station No. 1 network module becomes the standby system CPU (system switching will not occur in the redundant system).
Cyclic transmission after recovery from a communication error is shown below.
Station No. 1
(standby system)
0000
H
00FF
H
0100
Station No. 3
H
Received data
01FF
H
0200
Station No. 4
H
Received data
02FF
H
1) Station No. 2 of the control system CPU sends the send range data of the redundant system.
2) Station Nos. 1 and 2 receive data from other stations.
3) The data sent from station No. 2 of the control system CPU to other stations are transfered to
the standby system CPU as tracking device data.
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Redundant system
Station No. 2
(control system)
Host station
send range
Tracking 3)
1)
1)
Station No. 3
Received data
Station No. 4
Received data
POINT
(1) Communication by LX/LY is not supported by the pairing setting.
(2) Set the refresh target devices of LB/LW set in the host station send range of the
redundant system as tracking devices. For details, refer to the QnPRHCPU User's
Manual (Redundant System).
(3) When tracking a link special relay and a link special register, exercise care not to
transfer the link special relay (SB0020 to SB01FF) and the link special register
(SW0020 to SW01FF) in use by the system.
Station No. 3 Station No. 4
Station No. 1 (2)
Station No. 1 (2)
Received data
Received data
Host station
Station No. 3
send range
Received data
2)
2)
Host station
Station No. 4
send range
Received data
MELSEC-Q
2)
2)
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