Mitsubishi Electric MELSEC-A Series Manual page 20

1
INTRODUCTION
(c) 2-tier system 3: System configuration example using local stations/remote I/O stations
MELSECNET( II )
Optical loop
M
L1
L2
*1 As the transmission speed of MELSECNET/H is faster than that of MELSECNET(II), the distance between stations may
become shorter.
(d) 3-tier system 1: System configuration example using local stations only
MELSECNET( II )
Optical loop
M
L1
L2/m
I1
I2
*1 As the transmission speed of MELSECNET/H is faster than that of MELSECNET(II), the distance between stations may
become shorter.
1
- 3
MELSECNET/H
Optical loop
Network
1N 1 1M 4/2M
S P
1
R3
1N 2
S
MELSECNET/H
Optical loop
L3 1N 1 Network 1 1N
S
1N
I3 2N 1 Network 2 2N
S
System configuration precautions
1) Distance between stations: If this value
exceed the Q series specification values
when re-using the MELSECNET(II)
system cables, optical cables, etc. has to
be changed.
2) CPU: When replacing from an integrated
type CPU, one new slot (32 points) is
required.
3) Composite system: As a mixture of a PLC
Network
2R3
R
2
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.
4) New installation: A separate optical cable
is required for the remote I/O stations.
System configuration precautions
1) Distance between stations: If this value
exceed the Q series specification values
when re-using the MELSECNET(II)
1M 4
P
system cables, optical cables, etc. has to
be changed.
3
S
2) CPU: When replacing from an integrated
type CPU, one new slot (32 points) is
2/2M 4
S P
required.
3) Number of stations: When 65 modules
3
S
are connected, measures (e.g. dividing
into two networks of 64 modules or less
2N 2 having a different network No.) are
S
required.
*1
*1