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Having avoided using Factory Link for many years due to stability problems, I've just implemented a control system using Release 6.6 several months ago. I am having the same problem we've always had with Factory Link; the system runs fine for about 24 to 48 hours, then locks up the computer. The application I've developed runs under Windows NT and employs about 4000 digital tags. The application includes 15 graphic screens, alarm monitoring, an ODBC historian, interpreted math and logic, as well as, a bit of visual basic in the annimation. The application uses an SA85 card to talk with the PLC via Modbus Plus. I have a smaller system that runs along side of this one, that uses about 100 analog tags, and it runs for weeks on end with no problem. I'd appreciate any input from others using Monitor Pro/Factory Link. Thanks, Vernon Rocco Manager Of Engineering Norment Security Group, Northeast http://www.normentsecurity.com