Re: [milo-dev] Best way to monitorize items without freezing OPC server

[José García Hernández <jgarcia@xxxxxxxxxxx>]

Hi Kevin!

Thanks for your answer! I'll add some more details:

 - We are connecting to OPC DA through FS Gateway 3.0.
 - The server freezes when between 5000 - 8000 monitored items are suscribed. After that, all our requests fail with a timeout (15 seconds).

 - We tried to subscribe the monitored items in batches from 2500 to 100, all of them finally failing.
 - We tried also using subscriptions limited to 10.000 elements each (total of 9 subscriptions) without luck.

We will try to migrate our FSGateway to OIGateway next week if nothing fixes this :(

Regards. 

El mar, 15 jun 2021 a las 15:40, Kevin Herron (<kevinherron@xxxxxxxxx>) escribió:

Hi Jose,

What server are you connected to?

Is it freezing when you create the MonitoredItems or some time after?

If you haven’t already, try creating the monitored items in batches and also try splitting them across more than one subscription.

If none of these things work it’s possible that the server you’re connected to just can’t support that many MonitoredItems. You are doing this correctly by creating 80,000 items; there is no way to subscribe to a parent node and be notified of changes for any of its children.

> On Jun 15, 2021, at 05:25, José García Hernández <jgarcia@xxxxxxxxxxx> wrote:
>
> 
> Hi all!
>
> After updating to version 0.6.1, some issues we had were resolved. Now we have a technical problem / question that we would like to solve, if possible, with your help:
>
> - We have 20000 nodes of the style "ServerX.Sublevel.Node".
> - For each one of them, we subscribe to the properties "ServerX.Sublevel.Node.Status", "ServerX.Sublevel.Node.Priority", "ServerX.Sublevel.Node.Limit" and "ServerX.Sublevel.Node.Value".
> - We reached approximately 80,000 monitored items in this way, causing the OPC server to freeze and stop responding.
> - We use 10 seconds in sampling interval and 1 second in publishing interval (tested a lot more values).
> - We make requests from 100 to 100 (tested a lot more values) .
>
> How could we make the server support it? Is there a way to subscribe only 20,000 nodes and be informed of changes to any of their properties instead of subscribing to each one of them? Something like events?
>
> Thank you so much.
>
> Regards.
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