The PN/PN coupler continuously copies the output data of one network to the input data of the other network (and vice versa).

Parameterization

You either configure the PN/PN coupler using STEP 7 or a configuring tool which uses a GSD file to integrate the PN/PN coupler. You can use STEP 7 to set the required length of the input and output data. The output data of one side of the PN/PN coupler serve as input data for the other side, and vice versa.

You configure the I/O ranges using universal modules which are plugged into slots on the PN/PN coupler like real modules from the hardware catalog in the HW configuration. The universal modules span an I/O range over which data is exchanged between the two PROFINET subnets. The local CPU uses slot's configured inputs to read the values which the CPU of the other slot writes using the bus node's configured outputs. The local CPU uses slot's configured outputs to write values which the CPU of the other subnet receives using the bus node's configured inputs.

Example

The following example shows that both networks are independent of one another. This means that the user gives each PROFINET I/O network its own device name.

In the following picture, you can see device name "Subnet1" in network 1 and "Subnet2" in network 2:

Main FC of the PN/PN coupler (example)