Scenario 1 - Communication Via Fetch/Write And Cp1543-1; Mode Of Operation - Siemens SIMATIC S5 Manual

2 Engineering
Scenario 1 – Communication via FETCH/WRITE and
2.2
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.
Flow chart
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.
SIMATIC S5 CPU
OB1
FB40
Ethernet Communication (ISO on TCP) between SIMATIC S5 and
SIMATIC S7-1500 Controllers
Entry-ID: 109482475, V1.2,
HTB
SYNCRON
FETCH
1
FETCH request
HTB
FETCH
RECEIVE
Value 1
ALL
Value 2
...
...
...
WRITE
WRITE frame
HTB
SEND RW 3
Value 1
SEND
Value 2
ALL
...
...
...
07/2019
Conn.
CP1430
establish.
TCP
CR
Connection
configuration
CC
TSAP 1
FETCH
WRITE
...
2
2
4
Acknowledgment
S7-1500 CPU
CP1543-1
OB1
TSAP
list
TSAP Value 1
FETCH
Value 2
WRIT E
...
...
...
...
...
Value 1
Value 2
...
...
...
...
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