User Manual

Easy to communicate between devices

7.8 S7 communication

Easy Book

154 Manual, 03/2014, A5E02486774-AF

7.8.2

Creating an S7 connection

Connection mechanisms

To access remote connection partners with PUT/GET instructions, the user must also have

permission.

By default, the "Permit access with PUT/GET communication" option is not enabled. In this

case, read and write access to CPU data is only possible for communication connections

that require configuration or programming both for the local CPU and for the communication

partner. Access through BSEND/BRCV instructions is possible, for example.

Connections for which the local CPU is only a server (meaning that no

configuration/programming of the communication with the communication partner exists at

the local CPU), are therefore not possible during operation of the CPU, for example:

● PUT/GET, FETCH/WRITE or FTP access through communication modules

● PUT/GET access from other S7 CPUs

● HMI access through PUT/GET communication

If you want to allow access to CPU data from the client side, that is, you do not want to

restrict the communication services of the CPU, refer to "Access protection for the S7-1200

CPU" for more information.

Connection types

The connection type that you select creates a communication connection to a partner

station. The connection is set up, established, and automatically monitored.

In the Devices and Networks portal, use the "Network view" to create the network

connections between the devices in your project. First, click the "Connections" tab, and then

select the connection type with the dropdown, just to the right (for example, an S7

connection). Click the green (PROFINET) box on the first device, and drag a line to the

PROFINET box on the second device. Release the mouse button and your PROFINET

connection is joined.

Refer to "Creating a network connection" for more information.

Click the "Highlighted: Connection" button to access the "Properties" configuration dialog of

the communication instruction.