Mitsubishi Electric MELSEC-A Series Manual page 28

1
INTRODUCTION
(d) 3-tier system 1: System configuration example using local stations only
MELSECNET/B
Twisted
M
L1 L2/m
I1
1
- 11
MELSECNET/H
Optical loop
1N 1 Network 1 1N
S
1N
2N 1 Network 2 2N
S
Coaxial bus
1M 4
P
Network 1
1N 1
S
Network 2
2N 1
S
L3
Twisted (using existing cables)
1M 4
P
I2 I3
Network 1
1N 1
S
Network 2
2N 1
S
Twisted (using CC-Link
dedicated cables)
1M 4
P
Network 1
1N 1
S
Network 2
2N 1
S
System configuration precautions
1M 4
P
3
S
2/2M 4
S P
3
S
New installation: The installation has to be
changed for an optical loop system or a
2N 2
S
coaxial bus system.
1N 2/2M 4 1N 3
S P S
2N 2 2N 3
S S
Existing cables: Process the terminals for
1N 2/2M 4 1N 3
S P S
MELSECNET/H connection.
2N 2 2N 3
S S
New installation: Change the cables to CC-
Link dedicated cables.
1N 2/2M 4 1N 3
S P S
2N 2 2N 3
S S