Mitsubishi Electric MELSEC-A Series Manual page 19

1
INTRODUCTION
(1) Optical cable system
(a) 2-tier system 1: System configuration example using local stations only
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.
(b) 2-tier system 2: System configuration example using remote I/O stations only
MELSECNET( II )
Optical loop
M
R1
R2
*1 As the transmission speed of MELSECNET/H is faster than that of MELSECNET(II), the distance between stations may
become shorter.
MELSECNET/H
Optical loop
1M
P
L3 1N 1 Network 1 1N
S
1N
S
MELSECNET/H
Optical loop
1M
R3 1R1 Network 1 1R3
1R2
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.
4
2) CPU: When replacing from an integrated
type CPU, one new slot (32 points) is
3
S
required.
3) Number of stations: When 65 modules
2
are connected, measures (e.g. dividing
into two networks of 64 modules or less
having a different network No.) are
required.
System configuration precautions
1) Distance between stations: If this value
exceed the Q series specification values
when re-using the MELSECNET(II)
R
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.
*1
*1
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