Mitsubishi Electric MELSEC-A Series Manual page 81

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REPLACEMENT OF MELSECNET (II) AND /B (PLC TO PLC NETWORK)
Step 1: Control station (1Mp3) setting
Set the link parameter setting on MELSECNET II 2-tier master station as MELSECNET/H network 1 control station 1Mp3.
• In "Network range assignment (Common parameters)" of control station 1Mp3, set the LB/LW (first half size + second half size)
as a contiguous area on each station.
• It is divided into the first half LB/LW and the second half LB/LW, and transferred depending on the settings 1 and 2 of "Station
inherent parameter".
Step 2: Common parameter and refresh parameter settings of gateway station (1Ns1/2Mp3)
"Common parameter" setting and "Refresh parameter setting" of the MELSECNET II 3-tier master station are set as
MELSECNET/H network 2 control station 2Mp3 and network 1 normal station 1Ns1.
• In "Network range assignment (Common parameters)" of control station 2Mp3, set the LB/LW (first half size + second half size)
as a contiguous area on each station.
The range assignment should be performed including the same LB/LW size as that of 1Mp3 to relay 1Mp3.
• Set "Refresh parameter" to transfer B/W by dividing it into the first half B/W and the second half B/W on each station of network
2 control station 2Mp3 and network 1 normal station 1Ns1.
Make sure that B/W of networks 1 and 2 will not duplicate on the CPU.
• As "Interlink transmission parameters" parameter the gateway station 1Ns1/2Mp3 is set for, do not set a station inherent
parameter.
Step 3: Inter-link data transfer setting of gateway station (1Ns1/2Mp3)
Data transfer between 2 and 3-tier, which is performed automatically on MELSECNET II, is performed by Inter-link data transfer
on gateway station 1Ns1/2Mp3.
• LB/LW area shared by networks 1 and 2 is set by "Interlink transmission parameters" parameter of gateway station between
1Ns1 and 2Mp3.
Step 4: Station setting other than gateway stations (1Ns2, 2Ns1, 2Ns2)
"Station inherent parameter" and "Refresh parameters" of stations excluding gateway stations (1Ns2, 2Ns1, 2Ns2) are set.
• Set "Station inherent parameter" of network 1 normal station 1Ns2 as the same setting as that of network 1 control station
1Mp3.
• Set "Station inherent parameter" of network 2 normal station 2Ns2 as the same setting as that of network 2 normal station
2Ns1.
• Set "Refresh parameter" to refresh all area of common parameters assigned on control stations.
Concept of MELSECNET II 3-tier system replacement
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