Mitsubishi Electric Melsec A Series - Page 27

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INTRODUCTION
1
(c) 2-tier system 3: System configuration example using local stations/remote I/O stations
MELSECNET/B MELSECNET/H System configuration precautions
Twisted
Optical loop
1) New installation: The installation has to
be changed for an optical loop system
or a coaxial bus system.
2) Composite system: As a mixture of a
PLC to PLC network and a remote I/O
network is not allowed on the Q series,
the network has to be divided into two
networks having different network Nos.
For this reason, a separate network
module for the remote master station is
required.
3) Wire-saving: Changing to a wire-
saving network by using CC-Link or
CC-Link/LT is also recommended for
remote I/O stations.
Coaxial bus
Twisted/Optical loop
Twisted/Coaxial bus
M
L1 R3L2
1NS2
2R31MP4/2MR
Network
1
1N
S1
Network
2
1NS1 2R31NS2
Network 1
1M
P4/2MR
Network 2
2R31MP4/2MR
Network 2
(Optical loop)
1NS1 1NS2
Network 1 (Twisted)
1NS1 2R31NS2
Network 1
(Twisted)
1M
P4/2MR
Network 2
(Coaxial bus)