IO-Link system communication

The Beckhoff IO-Link masters are divided into two services.

• On the one hand, they act as an IO-Link master for the connected IO-Link devices;
• on the other hand, they act as an EtherCAT slave in relation to the PLC TwinCAT master.

The system communication is shown in the following illustration.

Fig.58: 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