IO-Link system communication

The Beckhoff EL6224 IO-Link master terminal is divided into two services.

On the one hand it represents an IO-Link master in relation to the connected IO-Link devices,
while on the other it is an EtherCAT slave in relation to the PLC TwinCAT master.

The system communication is illustrated in the following figure.

IO-Link system communication 1: — Illustration of the system communication of an EtherCAT master

In principle cyclic and acyclic data are exchanged. The cyclic process data can be accessed via the PDOs, the acyclic data via AoE. The events are additionally displayed under Diag History in the System Manager.

Cyclic data:

Process data
Value status

Acyclic data:

Device data
Events