OPCUA communication slow

General
1

Hi everyone!

I want to make a communication between my Node-RED server, which runs on my PC and a PFC100 WAGO PLC . After deploying and rebooting both systems, the communication works well but after a few minutes it's continuously getting slower and some of the active connections go inactive. I tried to delay the messages, but the way it worked its look terrible. Does anyone know the solution to this problem? Could someone help me solve this? Thank you!!

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If you could watch the code , it would be clear , why i thinks its terrible.
opcua com flow.json (55.5 KB)

2

How are the delay nodes configured ? As delays or as rate limiters ?
Try rate limit with 'drop immediate msgs'

3

Why not use a listener and just let the data come through as it comes.

I don't know the internals of the nodes you're using but perhaps it's creating objects every 1s. Might be a memory leak?

Anyhow, check out the built in examples. Node-red menu button (top right) --> import --> examples --> iiot

4

Thanks for your help , They are configured as delays. i understand , what rate limiters are , but i am not know, how should they solve my problem.

5

I am not using the iiot opc ua library . I tried to use "subsribe" type nodes , but it is not working well. The reason why i need them , is that the plc writes the variables. So if i switch on the 50% and 100% motor parallel, the plc switch them off , so this is why i want to read they state. With subsribe it works sometimes , but sometimes not.

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6

I have the same problem,when i use subscribe, sometimes work but sometimes not

7

Try using the IIOT nodes instead.

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8

Yes,i use iiot instead. the problem is iiot. others,i can't find the method to pub in iiot,i only find the method node to sub

9

not sure what you mean?

At first you say "when i use subscribe, sometimes work but sometimes not"

  • So are you using Listener and Response nodes for reading?

Now you say "i can't find the method to pub in iiot,i only find the method node to sub"

  • Are you saying you cant find a way to write?
10

i use the cs(client,server) mode to read and write before,but, When I try to use pub,sub mode,i only finded sub node(listener),and the sub response has no data sometimes,only response when the data change?

11

I believe thats how its supposed to work. Only get data upon change It minimises traffic.

If you need data adhoc, you can use a read node.

12

thank you very much, and ,iiot don't have pub node?only have write node?

13

Look in tool bar. No pub, no sub - but many others.

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There are even a shed load of built in samples/demos...

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14

thank you