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  3.Vnet/IPNetworkCongurationwithoutusingInformationNetwork

3-4

TI 30A10A05-01E

n Host address for open communications

Select the host address for open communications from the range of Vnet/IP network

addresses—which are 130 to 253—that you can use in open communications. The default host

address for recommended layer 3 switches is set to 253. Ensure that the host address is not

duplicated in Vnet/IP stations and all other devices in a Vnet/IP domain.

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For control communications (2~129) For open communications (130~253)

253

For SNTP server (254)

2541301291

L3SW (Default Setting: 253)

Reserved

Figure HostAddressAllocation

n Virtual IP address for control network TCP/IP communications

The control network TCP/IP protocol is used for communications such as downloading recipes

in CENTUM from HIS to FCS. Vnet/IP protocols support encapsulated control network TCP/

IP protocols or TCP/IP over V net to remain compatible with the existing V net system. For this

purpose, you have to set a virtual IP address. In normal conditions, use the following default IP

address that is automatically determined by the domain number and station number:

• IP address: 172.16.<domain number>.<station number>

• Subnet mask: 255.255.0.0

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IP address for control communications

UDP

Vnet/IP protocol

Control application

TCP/IP

over V net

Virtual IP addres for TCP/IP over V net

Figure VirtualIPaddressforcontrolnetworkTCP/IPcommunications

Aug.19,2011-00

YOKOGAWA Vnet/IP User Manual

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