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INTRODUCTION
1
(f) 3-tier system 3: System configuration example using local stations/remote I/O stations
*1 As the transmission speed of MELSECNET/H is faster than MELSECNET(II), and as the transmission method is different,
the distance between stations and overall distance become shorter.
MELSECNET( II ) MELSECNET/H System configuration precautions
Coaxial loop
Coaxial bus
1) Distance between stations: If this value
exceed the Q series specification values
when re-using the MELSECNET(II)
system cables, 3C-2V has to be changed
to 5C-2V.
*1
2) Overall distance: If this value exceeds the
Q series specification value when
MELSECNET(II) system cables are re-
used, measures (e.g. adding a repeater
unit) are required.
*1
3) CPU: When replacing an integrated type
CPU, one new slot (32 points) is required.
4) Duplex loop: When the transmission path
has to be duplexed, changes to an optical
loop system, etc. are required.
5) 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.
6) New installation: A separate coaxial cable
is required for the remote I/O stations.
1MP4
1NS1 1NS31NS2/2MP4/3MR
Network 1
2NS1 2NS2
Network 2
3R3
Network 3
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