He picked up the wall-mounted phone and dialed the control room. "Marcus, it's Alex. I need a 14-minute maintenance window for the blend tank logic change."
The problem was a timing fault in a periodic task. Every 317 minutes, a pressure spike occurred, and a downstream valve closed 80 milliseconds too slow. The fix was a small logic change in a single AOI (Add-On Instruction). Small change, enormous risk. softlogix 5800 download
He clicked .
90%... "Starting controller."