REPLACEMENT OF MELSECNET (II) AND /B (REMOTE I/O NETWORK)
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The following shows the replacement precautions when replacing MELSECNET (II) with
MELSECNET/H.
(1) Cables
For details on precautions for optical cables and coaxial cables, refer to Section 2.2.2 Cable
performance comparisons.
(2) System configuration
(a) System configuration using local stations and remote I/O stations in MELSECNET mode
and MELSECNET II mode
MELSECNET/H system, which is a composite system comprising local stations and remote stations,
provides high-performance functions by making a separation between local stations and remote
stations. It therefore cannot be configured by a mixture of local stations and remote stations. For this
reason, in a MELSECNET (II) system, when replacing a system, which comprises a mixture of local
stations and remote I/O stations connected to a single master station, with a MELSEC/H system, the
following system configuration is necessary. Normal stations are connected to a single control
station, and remote I/O stations are controlled by an additional remote master station (the control
station in a remote I/O system is defined as the "remote master station"). The following shows a
system configuration example.
System configuration using local and remote stations (optical)
3.7 Replacement Precautions
MELSECNET (II) (optical) MELSECNET/H (optical) Remarks (proposed measure)
Optical loop
Optical loop
• The control station of network No.1
configures a PLC to PLC network that
controls normal station 1 and normal
station 2.
• The other network module becomes the
remote master station, and the remote I/O
network system of No.2 is configured.
R3L1
M
L2
1N
S
1
1N
S
2
2R31M
P
4/2M
R
Network
1
Network
2
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