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Features and Functions
2.2.2
Types of Communication
The CP 243-1 IT has three types of S7 communication relationships which can be
used individually and in combination.
1. Coupling with STEP 7-Micro/WIN 32
2. Coupling with other, geographically remote components of the SIMATIC S7
family
3. Coupling with OPC-based applications on a PC/PG
2.2.3
Communication Partners
• S7-200 CPU with CP 243-1 or CP 243-1 IT
• S7-300 CPU with CP 343-1 or CP 343-1 IT
• S7-400 CPU with CP 443-1 or CP 443-1 IT
• PG/PC with OPC server
• PG/PC with STEP 7 Micro/WIN 32
The STEP 7 HW-Config program shows you the types of S7-300 CPUs and S7-
400 CPUs which support the S7 protocol XPUT/XGET (i.e., can communicate with
the CP 243-1 IT). When you select an S7-300 or S7-400 CPU in the catalog box
there, this CPU must support the function "S7 communication."
With systems from the S7-300 family, an XPUT/XGET client can only be used with
a related communications processor starting with version 1.1. You will find the ver-
sion of your communications processor in the MLFB number, among others. If you
are using a CP 343-1, the MLFB number must contain the character string "EX11"
or higher.
Always remember that the CP 243-1 IT does not support pure ISO connections.
Since the CP 443-1 ISO has neither TCP/IP nor RFC 1006, it is not able to com-
municate with a CP 243-1 IT.
Caution
Only one CP 243-1 or one CP 243-1 IT may be connected to an S7-200 CPU. If
additional SP 243-1 or CP 243-1 IT processors are connected, the S7-200 system
may not function correctly.
Note
Concerning communication with an OPC server, remember that the CP 243-1 IT
does not support automatic querying of the objects (e.g., DBxx, and so on) on the
S7-200.
A CP 243-1 IT can only communicate with an OPC server when this server sup-
ports the two S7 services READ and WRITE.
18
03/03
CP 243-1 IT
J31069-D0429-U001-A0-7618
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