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INTRODUCTION
1
(e) 3-tier system 2: System configuration example using 2-tier local stations and 3-tier
remote I/O stations
(f) 3-tier system 3: System configuration example using local stations/remote I/O stations
MELSECNET/B MELSECNET/H System configuration precautions
Twisted
Optical loop
New installation: The installation has to be
changed for an optical loop system or a
coaxial bus system.
A PLC to PLC network can be changed to a
twisted bus system, and a remote I/O
network can be changed to an optical loop or
coaxial bus system (refer to (c)).
Coaxial bus
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.
A PLC to PLC network can be changed to
a twisted bus system, and a remote I/O
network can be changed to an optical
loop or coaxial bus system (refer to (c)).
By processing the terminals, the existing
cables can be used for the twisted 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
M
L1 L3L2/m
r1 r3r2
2R2
Network 2 2R32R1
Network 1 1NS31NS1
1M
P4
1NS2/2MR
1MP4
1NS1 1NS31NS2/2MR
Network 1
2R1 2R32R2
Network 2
M
L1 L3L2/m
I1 r3I2
2NS2
Network 2 Network 3
3R32N
S1
Network 1 1NS31NS1
1M
P4
1NS2/2MP4/3MR
1MP4
1NS1 1NS31NS2/2MP4/3MR
Network 1
2NS1 2NS2
Network 2
3R3
Network 3
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