Mitsubishi Electric Melsec A Series - Example of Changing Parameters on 3-Tier System (When Only the First Half of Link Parameter Is Set)

REPLACEMENT OF MELSECNET (II) AND /B (PLC TO PLC NETWORK)
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2.5.3 Example of changing parameters on 3-tier system (When only the first half of
link parameter is set)
The following shows how to change a system on which first half of LB/LW link parameters is set, when
replacing the MELSECNET (II) 3-tier system with MELSECNET/H. Network range assignment of the
present MELSECNET (II) 3-tier system can be used in replacement with MELSECNET/H.
The MELSECNET (II) 2-tier is replaced with the network 1 of MELSECNET/H, and 3-tier is replaced with
the network 2. The MELSECNET (II) master station is replaced with the MELSECNET/H control station,
and MELSECNET local stations are replaced with MELSECNET/H normal stations.
.
MELSECNET ( II ) MELSECNET/H
Optical loop Optical loop
Concept of MELSECNET (II) 3-tier system replacement
Step 1: Control station (1Mp3) setting
Replace the link parameter setting of MELSECNET (II) 2-tier master station directly with "Network range assignment (Common
parameters)" of MELSECNET/H network 1 control station 1Mp3.
Step 2: Gateway station (1Ns1/2Mp3) setting
Data transfer between 2 and 3-tier, performed automatically on MELSECNET (II), should be set with parameter setting on
MELSECNET/H. Perform the following settings.
• Replace the link parameter setting of MELSECNET (II) 3-tier master station directly with "Network range assignment (Common
parameters)" of MELSECNET/H network 2 control station 2Mp3.
The range assignment should be performed including the same LB/LW size as that of 1Mp3 to relay the network 1 control
station 1Mp3.
• Set "Refresh parameters" not to duplicate B/W of networks 1 and 2 on the CPU.
• Set data transfer between 2 and 3-tier of MELSECNET (II) in "Interlink transmission parameters" between gateway stations
1Ns1 and 2Mp3.
Step 3: Normal station (1Ns2, 2Ns1, 2Ns2) setting
Set "Refresh parameters" of each normal station (1Ns2, 2Ns1, 2Ns2) on MELSECNET/H networks 1 and 2.
M L1/m L2
Empty
B/W 0 100 280 380 3FF
m l1 l2
100 280180 200
Link parameter of 2-tier
M L2
l1 l2
L1/m
A2UCPUA2UCPU
A3UCPU A2UCPU
A3UCPU
Link parameter of 3-tier
master station (L1/m)
MELSECNET (II)
2-tier
MELSECNET (II)
3-tier
MELSECNET/H
Network 2
MELSECNET/H
Network 1
Q06UDVCPU Q02UCPU
Q06UDVCPU
Q02UCPU Q02UCPU
1Ns1/2Mp3
1Mp3 1Ns2
2Ns2
Gateway
station
2Ns1