Which OPC UA Pub/Sub features are supported from what software version?

[DCEN_Tony]

Hello,

I am looking into the fastest and most reliable method for Core 2 Core communication.  From the How To Overview and other posts it seems that OPC UA Pub/Sub is the recommendation but looking further into it I can see that some features will only be supported from certain software versions.  Could anyone confim the following:

1. From what version is RT Data with guaranteed latency supported? (e.g, 1.16, 1.2 or 2.x?)

2. From what version can a typical cycle time of 10ms be achieved (either NRT or RT)?

3. It looks like configurable cycle time possible from V2.02.  If using older apps e.g. 1.2 how is the cycle time determined?

Many thanks

[NoRisk4Project]

Hello,

a guaranteed latency for RT data is supported with 2.04 and higher.

I would not use NRT with 10ms cycle time, because you can't secure, that the NRT thread is executed every 10ms. A NRT thread that can be displaced by another thread.

The cycle time is set during the writer configuration (inside the UA-Expert). Since 2.02 PubSub runs inside the scheduler so you can modify the cycle time afterwards also inside the scheduler.

[DCEN_Tony]

Thanks @NoRisk4Project 

Is RT data (without latency) also supported with 1.16 and 1.2?

[NoRisk4Project]

Hello,

you can use RT data with 1.20, but without a guaranteed latency.

If possible, I would switch to 2.0x, to have a guaranteed latency in combination with RT data.