Hi, Archie, i am using micrologix1100 over ethernet and slc 5/04 over DF1 driver and displaying data from both controllers on same page, it works good for minute and error comes saying "An unhandled exception of type 'System.IndexOutOfRangeException' occurred in AdvancedHMIDrivers.dll" what could be the reason? and also want to know can i use AHMI like scada. means is it possible to receive/send data to/from different PLCs working on different drivers of different manufactures.(like Allen Bradelly ,Omron and siemens in one application)