Mitsubishi Electric Melsec A Series - Page 21

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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
*1 As the transmission speed of MELSECNET/H is faster than that of MELSECNET(II), the distance between stations may
become shorter.
(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 that of MELSECNET(II), the distance between stations may
become shorter.
MELSECNET( II ) MELSECNET/H System configuration precautions
Optical loop Optical loop
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.
*1
2) CPU: When replacing from an integrated
type CPU, one new slot (32 points) is
required.
3) Number of stations: When 65 modules
are connected, measures (e.g. dividing
into two networks of 64 modules or less
having a different network No.) are
required.
MELSECNET( II ) MELSECNET/H System configuration precautions
Optical loop
Optical loop
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.
*1
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
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.
r2
r3r1
L3L1
M
L2/m
2R2
Network 2 2R32R1
Network 1 1NS31NS1
1M
P4
1NS2/2MR
I2
r3I1
L3L1
M
L2/m
2NS2
Network 2 Network 3
3R32N
S1
Network 1 1NS31NS1
1M
P4
1NS2/2MP4/3MR