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MELSEC-Q
2 SYSTEM CONFIGURATION
2.2 Multiple Remote I/O Network (Process CPU)
2.2.1 Configuration
A multiplexed remote I/O network system includes a multiplexed remote master station
and a multiplexed remote sub-master station. The multiplexed remote sub-master
station takes control of remote I/O stations when the multiplexed remote master station
fails.
Always assign station No. 0 to the multiplexed remote master station.
It is allowed to assign any of station number 1 to 64 to the multiplexed remote sub-
master station, provided that the number is not the same as that of remote I/O station.
Sixty-three remote I/O stations can be connected in an optical loop system, 31 stations
in a coaxial bus system.
POINT
Only the Process CPU is the CPU module that works as a multiplexed remote
master station and multiplexed remote sub-master station.
The CPUs other than the Process CPU do not work as a multiplexed remote
master station and multiplexed remote sub-master station.
QnPH
CPU
QJ71
LP21
I/OQJ72
LP25
I/O
I/OQJ72
LP25
I/O I/OQJ72
LP25
I/OI/OQJ72
LP25
I/O
QnPH
CPU
QJ71
LP21
Station No. 0
(Multiplexed remote
master station)
Power supply
Station No. 1
(Multiplexed remote
sub-master station)
Station No. 2
(Remote I/O station)
Power supply
Optical fiber cable
Station No. 64
(Remote I/O station)
Station No. 4
(Remote I/O station)
Station No. 3
(Remote I/O station)
Power supply
Power supply
Power supply
Power supply
Up to 63 remote I/O stations can be connected in an optical loop system.
Up to 31 stations can be connected in a coaxial bus system.