Ethernet Communication (ISO on TCP) between SIMATIC S5 and
SIMATIC S7-1500 Controllers
Entry-ID: 109482475, V1.2, 07/2019
2.4 Scenario 2b – Communication via programmed OUC
(single instructions) and internal CPU interface
2.4.1 Mode of operation
Overview
In this scenario, the SIMATIC S5 actively establishes an ISO-on-TCP connection
to the S7-1500 CPU via the CP1430 TCP using the internal PROFINET interface.
On the S7-1500 CPU end, the programmed connection is set up passively via the
OUC block TCON by the user program and is available for establishing the
connection of the partner. The data then are sent and received via the blocks
TSEND and TRCV.
For this connection, the SIMATIC S5 uses the standard handling blocks
SYNCHRON/SEND/RECEIVE. In the CP1430 TCP, the ISO-on-TCP connection in
the SIMATIC S5 is configured as an "active” duplex connection.
Sequence of the programmed OUC communication between S7 and S5 via single
instructions
The figure below schematically shows the connection established and the data flow
between SIMATIC S5 and SIMATIC S7-1500 using the SEND and RECEIVE
mechanism via ISO-on-TCP.
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