I am wondering what the merits and demerits of these two setups are:
- Using a RevPi Connect with Codesys license as Profinet device. No Profinet IRT Gateway.
- merits: no Gateway needed, no need to transfer data (process image) between RevPi and Gateway (would it be faster/have less latency?).
- demerits: Codesys license needed. Codesys does not seem to support Conformance Class C/IRT features.
- unclear: What latency can I expect when the RevPi Codesys Profinet device receives a message from a Profinet controller and responds to it? As far as I know, Codesys is not providing IRT/conformance class C, but for option 2, the IRT part is still unclear to me.
- Using a RevPi (e.g. Core S) with the Profinet IRT Gateway.
- The RevPi copies the process image every ~5 ms. So while according to the data sheet, the Gateway supports Profinet IRT, I am really not sure where this IRT feature is beneficial . Does IRT mean that the Gateway and some (IRT capable) Profinet controller can exchange data quickly (and with a jitter <31.25 µs)? But what does that mean exactly and what is it useful for if I cannot access this data quickly enough? Through the RevPi, I can only read or write data to the Profinet with at least 5 ms delay (because of the process image update), right? So what is the benefit of using the IRT Gateway? In what kind of setup does the IRT part make a difference having a RevPi attached to the Gateway?
Thank you very much for any help,