Data access from OPC UA to the logic is not synchronised with the PLC cycle

Question:
Does OPC UA read the data at the beginning and write the data at the end of the PLC cycle - simliar to the fieldbus behavior?

Answer:
From an OPC UA perspective, there is no "input" and "output" image of the PLC task, which is familiar from EtherCAT or PROFINET, for example.






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Taxonomy: Controller p500 , Controller p300 , Controller c300 , Controls-Controllers , Controller c520 , Controller c550 , Controller c500 , Controller c430 , Controller c400 , System
AKB-ID: 202400148
Last update: 2025/05/27
Category: 常见问题，提示和技巧

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