Interesting! How many tags can be issued in one request? Or how does this actually work? Our current project is a test equipment for multiple (several hundred) test objects. To initiate we need to read several arrays each with hundreds of elements from a database. This is done by VB script. Then after some PLC controlled processing, several hundred test result is written back to database, also by VB script. Apparently, it takes 100ms for each element to be read/written to PLC. Alas the loading and saving of data takes minutes! And I even had to split into several readings, as we run into "overload" error if the array exceeds 100 elements. It seems like only one element is accessed at a time per array. Very inefficient and slow!

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Split from Looks like HMI is slowing down PLC processing speed.