Communication Program In The Simatic S7-1500 - Siemens SIMATIC S5 Manual

2 Engineering
Table 2-5
No.
1 Data are requested from a S7-1500 via the CP1430 TCP by means of a FETCH
request of the SIMATIC S5.
2 The S7-1500 /CP1543-1 answers by sending the FETCH request with the requested
data including a positive acknowledgment to the CP1430 TCP. Otherwise, the
acknowledgment of the FETCH response by the CP1543-1 is negative. The data are
transferred from the CP1430 TCP to the data block of the SIMATIC S5-CPU via the
RECEIVE ALL handling block.
3 Via HTB SEND (RW), the SIMATIC S5 sends a WRITE request to the CP1430 TCP
with the data to be written to the CP1543-1. This one immediately forwards the data
to the corresponding data block. The data are transferred from the SIMATIC S5-
CPU (data block) to the CP1430 TCP via the SEND ALL handling block.
4 If the data have been successfully transmitted, the CP1543-1 responds with a
positive acknowledgement. Otherwise, the acknowledgment of the WRITE request
by the CP1543-1 is negative.
2.2.2

Communication program in the SIMATIC S7-1500

Overview
The following blocks contain the communication program in the S7-1500 CPU. In
this communication scenario, the S7-1500 is passive. No active communication
blocks are required.
OB 100
Startup
OB 1
Main
Function
A FETCH and a WRIE connection are established via a communication list in the
CP1543-1. Thus, a read and write access to the data areas of the S7-1500 CPU
can be set up. To detect the ongoing data access operations in the S7-1500, a
count value is written from the SIMATIC S5 to the S7-1500 (WRITE function),
incremented by +1 and made available in the FETCH data area. In the next
communication cycle, the increased value will be read by the SIMATIC S5 via the
FETCH connection.
Ethernet Communication (ISO on TCP) between SIMATIC S5 and
SIMATIC S7-1500 Controllers
Entry-ID: 109482475, V1.2,
FC40 FWData-
Management
User
block
07/2019
Process
ComWriteDB
ComFetchDB
Data blocks
18