Ethernet Communication (ISO on TCP) between SIMATIC S5 and
SIMATIC S7-1500 Controllers
Entry-ID: 109482475, V1.2, 07/2019
2.5 Scenario 3 – Communication via programmed OUC
(compact instruction) and CP1543-1 interface
2.5.1 Mode of operation
Overview
This scenario presents a variant of the OUC communication, in which the S7-1500
CPU uses the compact OUC block "TRCV_C” to receive data from the SIMATIC
S5.
Via the CP1543-1, the SIMATIC S7-1500 CPU actively establishes an ISO-on-
TCP connection to the SIMATIC S5 using the CP1430 TCP. The data are sent to
the SIMATIC S5 via the standard OUC block TSEND.
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 a "passive” duplex connection.
Sequence of the programmed OUC communication between S7 and S5 via compact
instructions
The figure below schematically shows the connection established and the data flow
between SIMATIC S5 and SIMATIC S7-1500 using the programmed SEND and
RECEIVE mechanism via ISO-on-TCP.
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