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Programming the program blocks (OUC)
5.1
Program blocks for OUC
Using the program blocks for Open User Communication (OUC)
The instructions (program blocks) listed below are required for direct communication
between S7 stations via Ethernet.
In contrast to other communication types, Open User Communication does not need to be
enabled in the configuration of the CP because corresponding program blocks need to be
created for this. You will find details on the program blocks in the information system of
STEP 7.
To useOpen User Communication, the CP requires a fixed configured IP address.
Note
Different program block versions
Note that in STEP 7 you cannot use different versions of a program block in a station.
Supported program blocks for OUC
The following instructions in the specified minimum version are available for programming
Open User Communication:
● TSEND_C V3.0 / TRCV_C V3.0
Compact blocks for connection establishment/termination and sending / connection
establishment/termination and receiving
Transfer of data
or
● TCON V4.0 / TDISCON V2.1
Connection establishment / connection termination
● TUSEND V4.0 / TURCV V4.0
Sending and receiving data via UDP
● TSEND V4.0 / TRCV V4.0
Sending and receiving data via TCP or ISOonTCP
● TMAIL_C V4.0
Sending e-mails
The program block can be found in STEP 7 in the "Instructions > Communication > Open
User Communication" window.
CP 1243-8 IRC
Operating Instructions, 06/2015, C79000-G8976-C385-01
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