Hello,
My experiences are with LV-DSC 6.1 (& earlier) from a couple of years ago. We used Modicon and AB PLCs on different projects with 1200 - 2000 PLC IO points.
Imo, 1000 IO points is a LOT for data sockets. If the OPC server is fast enough, the data socket server *might* keep up, but the CPU load would probably be pretty high. The 6.1 DSC engine was fast enough & quite efficient (for "memory tags"), but its the OPC server & the PLC(s) that may not be fast enough.
Test EVERY OPC server available (PLC vendor's, PLC-interface card vendor's, NI's, & 3rd-party like Matrikon) to compare performance & stability. There were very DRAMATIC differences between OPC servers back then.
Before OPC & DSC, we used <http://www.softwarewithrelish.com/> products for PLC communications. Very reliable software with the added bonus of PLC comm errors being directly reported to LV. OPC & DSC comm errors did NOT get reported to LV6.1.
LV8 shared variables *might* be faster than the previous DSC+Logos for "network tags", but as I stated earlier, its the OPC side of the house that will probably be your bottleneck with PLC points.
The new features of LV-DSC 8 sound GREAT! I hope to work with it later this year.
Good luck with your project!
Catfish ...