I have a job where I am building a machine that has to be integrated into an existing assembly cell. The cell has a slc 5/03 and the equipment I am building I am going to use a micro 1200. I know I need 1 1761-net-aic, but do I need another at the slc? My micro is going to have a PV 300 connected to it, can I also use the net aic to communicate between them? I know I may have to change some firmware to get this to work properly, but I am not exactly sure what components I need to mak this work. I will use a MSG cmd to communicate host and slave. I have done this type of thing before, after alot of head scratching and some pointers from here made it work.
Thamks, Gabe.

If you want more than two devices to access a DH-485 network you need each device to have the 1761-NET-AIC.

If the ML1200 is an "R" series (2 comm ports) and you are connecting the PanelView to its own dedicated port on the 1200, then you should only need 1 NET-AIC between it and the SLC. Just as long as the PanelView is using the separate comm port.