Hi, I want to read data only when it get changes in PLCs.
Anyone have the idea?
Have a look at the "Filter" node. You can set it to only pass a message if the message has changed.
Which type of PLC had been connected?
Hi,
I am using "Filter" node to read data only when it gets changes in PLCs .
Now I am trying to read data at least one time every hour (even if the data does not change), I did not find a way to do it.
Does someone know how to do it ?
Not at computer right now. But probably a couple of trigger nodes. One set to repeat every hour and one set to rate limit to once per hour.
OPC UA provides monitoring with deadband/absolute filter. Better to use it!
Inside client node, select action: monitor then you have option Deadband with parameters: