Networking Stations With Step 7 - Siemens S7-300 Configuration Manual

From the point of view of the SIMATIC S7 PLC, this is a passive communication function that
simply needs to be configured, the communications partner initiates connection
establishment.
For further information, refer to the system documentation of the SIMATIC S5 PLC or the
nonS7 station you are using.
Connection types
To access a station with FETCH or WRITE functions, a connection with FETCH passive or
WRITE passive mode must be configured on the SIMATIC S7. The following connection
types are possible:
● ISO transport
● ISO-on-TCP
● TCP
Coordinating access using the user program
You can use the program blocks AG_LOCK and AG_UNLOCK to coordinate access.
With these program blocks, you can coordinate access to system data areas by enabling
and disabling the connections so that no inconsistent data is created and transferred.
SIMATIC S5
On the SIMATIC S5 station, the FETCH/WRITE services are configured and addresses by
the READ ACTIVE/PASSIVE and WRITE ACTIVE/PASSIVE service types.
See also
Linking to other systems with FETCH/WRITE (Page 237)
1.8

Networking stations with STEP 7

Configuring
To allow stations to communicate with each other the networks must be configured in the
STEP 7 projects.
Configuring a network or subnet involves the following:
1. You create one or more subnets of the required subnet type in the project;
2. You select the properties of the subnet. Normally the default settings are adequate;
3. You connect the station "logically" to the subnet;
4. You set up connections for communication.
Configuring and commissioning S7 CPs for Industrial Ethernet
Configuration Manual, 09/2013, C79000-G8976-C182-13
Communication via Ethernet CPs in S7 stations
1.8 Networking stations with STEP 7
31