A plant room can look calm while a problem is building. A pump bearing warms up. A chilled water differential pressure drifts out of range. A condensate tray starts to fill. A small leak collects behind equipment where no one walks until the next scheduled inspection. Most facilities teams already have a building management system, a PLC, or both. Those systems do the heavy lifting for control. They run chillers, pumps, fans, valves, boilers, cooling towers, and air handling