Siemens S7-300 - 3 Configuration and parameter assignment; 3.1 Configuring

Communication via Ethernet CPs in S7 stations
1.5 S7 communication via Industrial Ethernet
Configuring and commissioning S7 CPs for Industrial Ethernet
Configuration Manual, 09/2013, C79000-G8976-C182-13
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Nodes
Two situations must be distinguished depending on the device type and plant configuration:
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Client and server functionality at both ends
S7 connections can be operated between the following nodes with the entire functionality
of S7 communication:
– between S7 stations S7300 and S7400;
– between S7 stations and PC/PG stations with an Ethernet CP.
Figure 1-2 Nodes communicating on S7 connections over Industrial Ethernet
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Client and server functionality at one end only (S7 connections configured at one end)
In the following situations, write and read functions can be implemented with PUT / GET
on S7 connections configured at one end:
– S7 communication over routers
PG/PC stations can access S7 stations connected to a different subnet or subnet type
(PROFIBUS / Ethernet). This is only possible if the subnets are connected via routers
(for example IE/PB Link); in this case, S7 stations are servers.
S7 communication is possible via a gateway.