Closed ptorrent closed 2 months ago
Subscriptions are a built-in feature of the Beckhoff ADS protocol, and follows publish-subscribe semantics, not polling.
Check the documentation for subscribe()
.
I suppose that polling at less than 1 second is not recommanded?
ADS subscriptions can easily provide updates 10 or even 100 times per second.
Thanks @crishoj!
I'm just working on documentation of v2 and I will try to improve this too.
It's indeed so that PLC checks for the value changes and sends the data when needed. There is no polling, ads-client will not send any requests at all.
I just lately used ADS notifications to monitor modbus data from 1ms cycle, using cycle time of 0. It worked just fine. However that was with .NET library but I have tested ads-client with 1ms before as well.
So in short, use as small cycle time as you feel that is (really) needed.
Hello there,
I have a very fast-moving value (input 1/0). How does registration work? Is it polling? Is it an event sent by the automaton when the value changes?
I suppose that polling at less than 1 second is not recommanded?
Thanks for your support :)