Excerpt from [ENCP], chapter 4.1.

Data, which a device cyclically receives from the controller and which it outputs to the device application or the peripherals.

Data, which a device cyclically sends to the controller.

For Devices, all Input and Output Data (cyclic transmission).

For a Drive Object (PROFIdrive), all Input and Output Data (cyclic transmission).

For an Encoder Object (encoder), all Input and Output Data (cyclic transmission).

For Devices, all data related to the control process (e.g. gain factor, state variables, …). The Process Data typically is mapped on parameters (access is with acyclic transmission).