Hello, 

I have a problem with relatively slow communication between PLC NX1P2 and Zenon. I use 3400 variables in the project. When I open a new window I have to wait 1-2s before all variables are loaded. I have set the refresh priority of variables between 100ms and 2s. I also checked the Use block access option and entered 1994 bytes for the message size. When I select the Keep update list in memory option, refreshing variables is very slow and takes 2s for the highest priority. I do not have any errors related to the Omron EIP driver in the log files. The average communication speed during visualization is 150kbps, but when I use the variable import option in Engineering Studio, the speed is twice as fast, so I think the problem may be on the SCADA side. I checked the correctness of the types and sizes of variables between PLC and PC. Is there anything else I can check or change to increase the communication speed?

I am using zenon 12 Build 324144, Windows 10.

Thanks for your reply.