Ethernet Communication (ISO on TCP) between SIMATIC S5 and
SIMATIC S7-1500 Controllers
Entry-ID: 109482475, V1.2, 07/2019
2.3 Scenario 2a – Communication via parameterized OUC
(single instructions) and internal CPU interface
2.3.1 Mode of operation
Overview
In this scenario, the SIMATIC S7-1500 CPU actively establishes an ISO-on-TCP
connection to the S5 via the CP1430 TCP using the integrated PROFINET
interface.
On the S7-1500 CPU end, a parameterized connection configuration is used. The
data are sent and received bidirectionally via the OUC blocks TSEND and TRCV.
For this connection, the SIMATIC S5 uses the standard handling blocks (HTB)
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 parameterized OUC communication via single instructions
The figure below schematically shows the connection established and the data flow
between SIMATIC S5 and SIMATIC S7-1500 using the parameterized SEND and
RECEIVE mechanism via ISO-on-TCP.
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