Mitsubishi Electric Melsec A Series - Page 24

INTRODUCTION
1 - 7
1
(d) 3-tier system 1: System configuration example using local stations only
*1 As the transmission speed of MELSECNET/H is faster than MELSECNET(II), and as the transmission method is different,
the distance between stations and overall distance become shorter.
(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 MELSECNET(II), and as the transmission method is different,
the distance between stations and overall distance become shorter.
MELSECNET( II ) MELSECNET/H System configuration precautions
Coaxial loop
Coaxial bus
1) Distance between stations: If this value
exceed the Q series specification values
when re-using the MELSECNET(II)
system cables, 3C-2V has to be changed
to 5C-2V.
*1
2) Overall distance: If this value exceeds the
Q series specification value when
MELSECNET(II) system cables are re-
used, measures (e.g. adding a repeater
unit) are required.
*1
3) CPU: When replacing an integrated type
CPU, one new slot (32 points) is required.
4) Number of stations: When 65 modules
are connected, measures (e.g. dividing
into two or three networks of 32 modules
or less having a different network No.) are
required.
5) Duplex loop: When the transmission path
has to be duplexed, changes to an optical
loop system, etc. are required.
MELSECNET( II ) MELSECNET/H System configuration precautions
Coaxial loop
Coaxial bus
1) Distance between stations: If this value
exceed the Q series specification values
when re-using the MELSECNET(II)
system cables, 3C-2V has to be changed
to 5C-2V.
*1
2) Overall distance: If this value exceeds the
Q series specification value when
MELSECNET(II) system cables are re-
used, measures (e.g. adding a repeater
unit) are required.
*1
3) CPU: When replacing an integrated type
CPU, one new slot (32 points) is required.
4) Number of stations: When 65 modules
are connected, measures (e.g. dividing
into two or three networks of 32 modules
or less having a different network No.) are
required.
5) Duplex loop: When the transmission path
has to be duplexed, changes to an optical
loop system, etc. are required.
I2
I3I1
L3L1
M
L2/m
1MP4
1NS1 1NS31NS2/2MP4
Network 1
2NS1 2NS32NS2
Network 2
r2
r3r1
L3L1
M
L2/m
1MP4
1NS1 1NS31NS2/2MR
Network 1
2R1 2R32R2
Network 2