I am using Rs Logix 500 and I believe its V.5.2. I am hooked up to a Micrologix 1200 going thru a AIC Interface Module. There is also a PV 600 in the network. When I am online or in remote program it will disconnet at will at any time. To get back online I have to go into RSLinx, delete the driver and reconfig. By the time I get done with all this I forget what i wanted to change in the program. Some what frustrating. I have also seen this going thru a 1747- PIC. When it came time to assemble the program changes it would disconnect. Any ideas???