[ISS Support Case] Allen Bradley CIP Driver Optimization Inquiry

Description

recently updated a project from IndusoftWeb Studio version 8 to IndusoftWeb Studio 2020 R2 with ABCIP drivers 11.24. The application is a client server application before the update there were 8 clients with 8 CompactLogix PLC rev 32 and there were no issues. After the update we added 2 new clients and 2 new PLC to the system the new plc are identical to the other 8 and so the tags. The strange thing is that we are having communication issues with the new clients and PLC, we double check the tags name no errors for invalid tags. Issues I see is sometimes we see ???? for the values one of the screens. We also have a script on a screen, while open script that execute every second writing 6 values (date/time) to the PLC sometimes the month and day dont get updated. I go online with the plc using Studio 5000 I can see the seconds getting update but not the day and month if I write 0 to the tags using Studio 5000 then I see the values getting updated from the HMI. I am looking for recommendations on the best way to optimize the ABCIP drives currently I have just the main driver sheet with a total of 2282 tags for all 10 plcs. What is the recommended for buffer size, simultaneous request maximum and maximum per station, currently they are default values of 1 should I change it to maximum request to and the driver will then establish one thread per station/plc 10 and 1 per station.

• Author: Kevin Modlin
• Published: October 17th, 2025

Details: