Siemens SIMATIC NET CP 243-1, Operating Instructions Manual

Page: 90 / 142

Configuration
3.5 Configuration of a communications partner with STEP 7
CP 243-1
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Operating Instructions, 03/2012, C79000-G8976-C244-02
S7-300 system as client
If you want to use an S7-300 system as client (i.e., you have enabled "Establish an active
connection" in the "Properties - S7 connection" dialog), you cannot simply use STEP 7
Micro/WIN 32 and enter the TSAP specified in STEP 7 in the "Local" entry as the connection
access point for your S7-300 system. Instead you must convert this TSAP according to the
following rules:
1st byte of the TSAP:
Is taken from STEP 7, "Address details" dialog, "Local" entry, "TSAP" box.
2nd byte of the TSAP:
Is derived from the rack and the slot of your Ethernet communications processor on your S7-
300 system. The first 3 bits contain the number of the rack in which your Ethernet
communications processor is installed on your S7-300 system. The remaining 5 bits contain
the slot of your Ethernet communications processor in your S7-300 system.
You will find these two pieces of information in the STEP 7 program package HW Config.
Example:
Your S7-300 system contains a CP 343-1 in slot 4 of rack 0. When you configure a
connection with STEP 7, this is indicated as local TSAP value 10.02. With STEP 7
Micro/WIN 32, use TSAP 10.04 as the communication access point in the S7-300 system.
The 1st byte (10 in our example) is adopted. The 2nd byte is derived from the rack (0 in our
example) and the slot (4 in our example).
NOTICE
The specified communication access points (TSAPs) in STEP 7 and in STEP 7 Micro/WIN
32 must be compatible. No client services may be operated from partners on a client
connection of the CP 243-1. A clear client-server relation must exist.
Free connections
A free connection can only be used when your S7-300 or S7-400 system is acting as server.
Free connections do not need to be configured in STEP 7. Standard S7-300 and S7-400
systems are designed so that they can communicate via free connections.