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Features and functions 09/02

CP 243-1

10 J31069-D0428-U001-A1-7618

2.2 S7 communication via Industrial Ethernet

2.2.1 Application

The S7 communication via Industrial Ethernet makes program-controlled commu-

nication via communication SFBs/FBs and configured S7 connections possible.

The CP 243-1 supports S7 communication via Industrial Ethernet by means of the

XPUT/XGET and READ/WRITE services. In general, up to 212 bytes of user data

can be transmitted per command. However, if the CP 243-1 is being operated as a

server, up to 222 bytes can be transmitted per read operation.

The CP 243-1 supports up to 8 communication channels to clients or servers on

one or more remote communication partners. The CP 243-1 operates according to

the client/server principle per channel. Per channel, only one command at a time is

received, processed and responded to with a positive or negative response. Only

after a response has been sent will the CP 243-1 accept another command.

If the CP 243-1 receives more than one command on a channel configured as a

server, only the first command is processed and the following commands are ig-

nored until the transaction is completed, i.e. until a response has been sent. The

CP 243-1 is not equipped with channel-specific command management and does

not buffer commands.

Prerequisites for communication with a PC/PG

As before, the S7-200 CPU can still be accessed by a PG/PC via the PPI interface.

In addition, it can also be accessed via the CP 243-1 through Ethernet. The follow-

ing prerequisites must be met to use this alternative:

− An Ethernet card is inserted in the PG/PC and configured, and there is an

Ethernet or TCP/IP connection to the CP 243-1 (possibly through routers,

firewalls, ...)

− STEP 7 Micro/WIN 32, version 3.2.1 or higher, is installed on the PC/PG.

− The CP 243-1 has been assigned a valid IP address. This address can be

defined in the configuration or retrieved from a BOOTP server via the

BOOTP protocol.

At this time, only one STEP 7 Micro/WIN 32 can communicate with the S7-200

CPU via a CP 243-1.

Siemens SIMATIC NET CP 243-1 User Manual

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