Fetch/Write Services (Server) - Siemens S7-300 Configuration Manual

Communication via Ethernet CPs in S7 stations

1.7 FETCH/WRITE services (server)

Nodes
The SEND/RECEIVE interface allows programcontrolled communication on Industrial
Ethernet between the SIMATIC S7 PLC and the following:
● SIMATIC S7 with an Ethernet CP
● SIMATIC S5 with an Ethernet CP
● PC/PG with an Ethernet CP
● Stations with Ethernet attachment
Figure 1-4
1.7 FETCH/WRITE services (server)
Application
The FETCH/WRITE functionality on the SEND/RECEIVE interface provides further services
on configured transport connections.
The FETCH/WRITE interface is used primarily to connect SIMATIC S7 to SIMATIC S5 and
to other nonS7 stations (for example PCs).
● FETCH
The partner on the connection (SIMATIC S5 or nonS7 station) can read system data on
the SIMATIC S7 PLC.
● WRITE
The partner on the connection (SIMATIC S5 or nonS7 station) can write system data to
the SIMATIC S7 PLC.
30
SIMATIC S7 PLC with possible communications partners on the SEND/RECEIVE
interface
Configuring and commissioning S7 CPs for Industrial Ethernet
Configuration Manual, 09/2013, C79000-G8976-C182-13