Value range for the IP address

255.255.0.0 Decimal = 1111 1111.1111 1111.0000 0000.0000 0000 binary 255.255.128.0 Decimal = 1111 1111.1111 1111.1000 0000.0000 0000 binary 255.254.0.0 Decimal = 1111 1111.1111 1110.0000 0000.0000.0000 binary 255.255.1.0 Decimal = 1111 1111.1111 1111.0000 0001.0000 0000 binary

Industry Automation and Drive Technologies - SCE

Notes regarding networking on the Ethernet (additional information is provided in Appendix V of the training manual):

MAC address:

The MAC address consists of a permanent and a variable part. The permanent part ("Basic MAC address") identifies the manufacturer (Siemens, 3COM, ...). The variable part of the MAC address differentiates the different Ethernet stations and should be assigned globally unique. On each module, a MAC address specified by the factory is inscribed.

Value range for the IP address:

The IP address consists of 4 decimal numbers in the value range 0 to 255, separated by a period; for example: 141.80.0.16

Value range for the subnet screen form:

This screen form is used to establish whether a station or its IP address belongs to the local subnet, or can be reached only by means of a router.

The subnet screen form consists of 4 decimal numbers in the value range 0 to 255, separated by a period; for example: 255.255.0.0

The 4 decimal numbers of the subnet screen form have to contain -in their binary representation- from the left a series of gapless values "1" and from the right a series of gapless values "0"..

The values "1" determine the area of the IP address for the network number. The values "0" determine the area of the IP address for the station address.

Example: Correct values:

Incorrect value:

Value range for the address of the gateway (router):

The address consists of 4 decimal numbers in the value range 0 to 255 separated by a period; for example, 141.80.0.1.

Relationship of the IP addresses, router address and subnet screen form:

The IP address and the gateway address must differ only at those positions where a "0" is shown in the subnet screen form.

Example:

You entered the following: for subnet screen form 255.255.255.0; for IP address 141.30.0.5 and for router address 141.30.128.1.

The value for the IP address and the gateway address is to differ only in the 4th decimal number. However, in the example, the 3rd position already differs.

In the example, we have to alternatively change:

-the subnet screen form to: 255.255.0.0 or

-the IP address to: 141.30.128.5 or

-the gateway address to: 141.30.0.1

TIA Training Document	Page 18 of 47	Module
E12
Status: 01/2010	Vision Sensor Shape Check with SIMATIC S7-300F 2PN/DP and VS120