I'm replacing a DCS with a PLC, and I have enough bubbles on my P&IDs from field devices, DCS points, etc. that are already in existence. I don't want to add bubbles for PLC points, then restructure the shared display/control bubbles to indicate every monitored/alarmed point. This would make my P&IDs very difficult to redline and redraw.
New projects pose the same problems: how much detail should be assigned to the bubbling of HMI/SCADA points? (I would bubble every PLC point for a new project.)
Anyone got any ideas or current practices they could share?