I am currently setting up a Perspective system that connects to 5 separate OPC-UA Servers running directly on remote PLC’s.
Because these are remote devices, I would like to reduce the default polling rate from SCADA to the Servers, however am getting a bit confused as to what actually dictates when the devices will be polled.
All tags are attached to a single Tag Group that have the settings as per the attached screenshot. I would like these tags to all poll at 3 minute intervals.
However when I look at the OPC Connections in the status section in the gateway, it indicates a “Requested Sampling Interval” that matches my Tag Groups rate, but it then indicates a “Revised Sampling Interval”. When I look at the data going to the sites using wireshark, I can see that Ignition is polling the device at the time defined by the “Revised Sampling Interval” and not what I am setting in the Tag Group.
Where is this “Revised Sampling Interval” coming from, and how do I set the polling rate to match what is being configured on the Tag Group?