Siemens CU240S DP Instruções de Operação descarregar pdf (Página 168)

Communication

6.5 Communication via PROFINET

Control Units CU240S

168 Operating Instructions, 10/2007, A5E00766042B AC

IP address assignment

The TCP/IP protocol is a prerequisite for establishing a connection and parameterization.

This is the reason that an IP address is required.

The IP addresses of IO devices can be assigned by the IO controller and have always the

same sub-network mask as the IO controller. The IP addresses can be consecutively

assigned from the IP address of the IO controller.

If the IP address is set by the IO controller, it is saved in a volatile fashion. Furthermore, you

can change the IP address manually. In this case, the IP address is saved in non-volatile

fashion.

If the IP address is to be stored in a non-volatile memory, the address must be assigned

using the Primary Setup Tool (PST).

This can also be carried out in HW Config in STEP 7, where the function is called "Edit

Ethernet node".

Note

If the network is part of an existing Ethernet company network, obtain the information from

your network administrator (IP address, sub-network mask and a router that is possibly being

used.)

Sub-network mask

The bits set in the sub-network define the part of the IP address that contains the address of

the (sub-) network. The subnet mask provides a filter function for the Ethernet telegrams.

The following generally applies:

● The network address is obtained by an AND operation on the IP address and sub-

network mask

● The node address is obtained by an AND NOT operation on the IP address and sub-

network mask.

Example of the sub-network mask

Sub-network mask: 255.255.0.0 (decimal) = 11111111.11111111.00000000.00000000

(binary) IP address: 140.80.0.2 significance: The first 2 bytes of the IP address decide the

sub-network - in other words 140.80. The last two bytes address the node - in other words

0.2.

Default Gateway

The default gateway enables communication via an internal server.

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Siemens CU240S DP Instruções de Operação Página 168