Seeing significant delay in the read back value of a setpoint after a user inputs a new setpoint often in the range of 10-15 seconds. We have two setups to Rockwell controllers - one goes through and FT Linx server (a solution Rockwell had suggested) another through the logix driver. In both cases lag is barely noticeable with a test set of tags(around 10 or so). When we put in the full set of tags (around 150k) we see it slow down, revert to the old value at the fallback time, and go to the correct value 10-15 seconds later. We were able to see that the controller is receiving and updating the value quickly using Studio 5000, but that value is not getting back to the HMI. Our final design system will have around 750k tags
Across how many PLCs?
How many tag providers?
How many devices?
What poll rate for your tag groups?
Are you doing direct poll or leased tags?
Is there a reason you need Read after Write, which is what it sounds like you have configured.
Have you increased the connections and CIP settings on the logix driver?
Are you reading AOI tags?
What model/firmware of logix?
What’s the load % on each devices status?
Still very new to Ignition and design side of SCADA
We have multiple gateways across a few sites but I will pick the laggiest:
PLCs: we want to run off a redundant pair
Tag Providers: 8 Realtime Providers, 20 Historical
Devices: I just see the Logix Driver. We have 2 OPC connections, one of which is the AWS hosted Linx Gateway
Subscribed/Leased for the most part but we put individual tags in polling
CIP Size and Connections: Since we are running through the FT Linx Gateway, we didn’t change these
We had disabled Read after Write since we read a about a race condition occurring
We are reading AOI tags
ControlLogix L85EP
Logix Driver is at 12% but we are not really using it