Are you sure the PLC is trying to open a new TCPconnection on reboot?
Can you simulate the PLC using hyperterminal? If you close hyperterminal, and reopen the TCP connection to the smart camera, does it work?
We improved the connection mechanisms in later versions of VBAI, I would also recommend you try it with the latest shipping version: Vision Builder AI 2011 SP1. You can download a trial version from our web site: