Product Description; Field Of Applications - Siemens SIMATIC S7 Manual

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Product Description

1.1

Field of Applications

Placement in the
System Environ-
ment
Function of the
FBs
TCP/IP with
CP343-1 / CP443-1
OPEN MODBUS / TCP communication via CP343-1 and 443-1
2XV9450-1MB00; Manual edition 4.3
The driver described here is a software product for the Communications
Processor CP343-1/CP443-1.
The CP343-1 can be used in the SIMATIC S7-300 automation system and
can establish communication links to partner systems.
CP443-1 can be used in the SIMATIC S7-400 automation systems and can
establish communication links to partner systems.
These function blocks enable a communication link between CP343-1 /
CP443-1 and a device that supports the Open MODBUS/TCP protocol. The
function codes 1, 2, 3, 4, 5, 6, 15 and 16 are provided.
Data transmission is carried out following the Client-Server principle.
The SIMATIC S7 can act as both client and server during the data
transmission.
TCP/IP with CP343-1 and CP434-1 uses static connections. The TCP
connection is not disconnected during errror-free operation.
Network configuration of STEP7 enables only a unique use of a specific
port number, when using TCP native stack of the CP.
However, with specific CP modules it is possible to use multiple connection
via port 502 to different clients simultaneously.
In section 3.6 "Mulitple connections via port 502" you can find technical details
regarding this matter.
Product description
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