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Imagine a food processing plant on a busy afternoon. Steam pressure in a pasteurization line starts to fluctuate wildly, triggering an alarm. Operators rush over to find a large electric actuator controlling a steam valve stuck at 50% open. This actuator is networked via Modbus to the plant’s programmable logic controller (PLC), which has been signaling it to adjust – but the valve isn’t responding in time. In fact, the actuator’s status lights flicker, indicating communication timeouts. The result: pressure swings that threaten product quality and safety. Engineers observe the issue: a slight control delay between the PLC command and valve movement, causing a surge of steam before the valve catches up. In this real-world scenario, a simple communication glitch → delayed valve response → pressure spike chain unfolds. The team needs to diagnose whether it’s a mechanical jam or a Modbus signal dropout causing the actuator’s drift from its setpoint.