Mitsubishi Electric Q Series Reference Manual page 318

7 APPLICATION FUNCTIONS
SM255 (Distinction between regular/standby network)
Module 1
SM 256 (Refresh from the network modules to the CPU)
SM 257 (Refresh from the CPU to the network modules)
SM260 (Distinction between regular/standby network)
Module 2 SM261 (Refresh from the network modules to the CPU)
SM262 (Refresh from the CPU to the network modules)
CPU
Station
No. 1
Station
No. 2
Station
No. 3
Station
No. 4
Both networks
are executing
data linking.
CPU
Station
No. 1
Station
No. 2
Station
No. 3
Station
No. 4
7 - 116
(2) Set different network Nos. for the regular and standby network modules.
[When the regular network is normal]
At the initial startup, the CPU module controls the on/off status of the special relay
(SM).
Signal
Station No. 1
Regular Standby
SM257
Station Station
SM262
No. 1 No. 1
SM256
Station
Station
No. 2
No. 2
SM256
Station
Station
No. 3
No. 3
SM256
Station
Station
No. 4
No. 4
Regular Standby
Station Station
SM256
No. 1 No. 1
Station Station
SM256
No. 2 No. 2
Station Station
SM256
No. 3 No. 3
SM257
Station Station
SM262
No. 4 No. 4
Station No. 4
Status
Off (Regular)
Off (Refreshes)
Off (Refreshes)
On (Standby)
On (Does not refresh)
Off (Refreshes)
Station No. 2
CPU
SM256
Station
No. 1
SM257
Station
SM262
No. 2
SM256
Station
No. 3
SM256
Station
No. 4
CPU
Station
SM256
No. 1
Station
SM256
No. 2
SM257
Station
SM262
No. 3
SM256
Station
No. 4
Station No. 3
MELSEC-Q
Remarks
Controlled by the CPU.
Controlled by the user.
(Initially controlled by the CPU)
Controlled by the CPU.
Controlled by the user.
(Initially controlled by the CPU)
Regular Standby
Station Station
No. 1 No. 1
Station Station
No. 2 No. 2
Station Station
No. 3 No. 3
Station Station
No. 4 No. 4
Regular Standby
Station Station
No. 1 No. 1
Station Station
No. 2 No. 2
Station Station
No. 3 No. 3
Station Station
No. 4 No. 4
7 - 116