Ethernet Communication (ISO on TCP) between SIMATIC S5 and
SIMATIC S7-1500 Controllers
Entry-ID: 109482475, V1.2, 07/2019
2.2 Scenario 1 – Communication via FETCH/WRITE and
CP1543-1
2.2.1 Mode of operation
Overview
Via the CP1430 TCP, the SIMATIC S5 is configured as an active FETCH/WRITE
client.
This communication type requires a CP1543-1 in the SIMATIC S7-1500 station
which is configured as a passive TECH/WRITE server and which receives the
connection and communication requests of the SIMATIC S5. The TSAPs for the
ISO-on-TCP communication are defined via an access ID list in the CP1543-1.
With these settings, the SIMATIC S5 can connect to the SIMATIC S7-1500.
Sequence of the FETCH/WRITE communication between S7 and S5
The figure below schematically shows the data flow between SIMATIC S5 and
SIMATIC S7-1500 via the FETCH/WRITE mechanism.
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