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Assigning IP & Sub Network Mask Addresses

Overview

All Maxum II units connected to a network must have a unique 32-bit IP and a common sub network

mask (subnetmask) address. The subnetmask together with the IP address is used to define the logical

network number of the device. The user must assign the addresses before the unit is network

operational.

Definitions

IP Address. The IP address is a 32-bit address that defines each Maxum II’s network ID and host ID.

Typically the customer’s network administrator assigns the address. The address IP is entered in a dotted

decimal notation format; example: xxx.xxx.xxx.xxx.

Subnetmask. The subnetmask defines which portion of the IP address is the network address and which

portion is the host or device address. The subnetmask is a 32-bit value containing one bit for the network

and subnet ID and zero bits for the host ID. The subnetmask is ANDed with the IP address to determine

which portion of the IP address is the network address. For example, with the IP address 192.165.0.1 and

a subnetmask of 255.255.0.0, the network address is 192.165.X.X, and the host or device address is

X.X.0.1 (network.network.device.device.) This particular subnetmask is a Class B address and provides

16 bits for the local address. This means that with a Class B address mask there is room for 2^16 or

65535 unique host addresses. There are four standard subnet classes: Class A, B, C, and D.

How to Assign an IP & Sub Net Address

If the unit will be in a closed plant area and not connected to the Internet, you can use the factory set

addresses or you can select an address.

For an IP Address you can select an address within the entire range of 192.165.0.xxx (xxx equals 000 to

255.) For a subnet mask address you can select an address within the entire range of 255.255.0.xxx (xxx

equals 000 to 255.) Typically the same subnet mask is used on all Maxum II’s on a given network, e.g.:

255.255.000.000.

Ask your network administrator to assign the addresses within the specified range.

Setting Maxum II IP Address

The MMI can be used to view or modify the factory set addresses. From the main menu use the following

menu path:

Select Menu > Configuration Menu > 1 > IP Set Info

Go to line 1 and 2 and change LAN 1 IP address and LAN 1 IP mask address in accordance with the

input from your network administrator.

Note: The Maxum II must be reset for the new IP entries to take effect.

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Siemens GC..M.. Manual de instalación Pagina 42