What term is used to describe a method where a machine resumes operation upon receiving an input signal?

The term that accurately describes a method where a machine resumes operation upon receiving an input signal is "Interrupt." In programmable controller systems, an interrupt refers to a signal that prompts the processor to temporarily halt its current operations to address a particular condition or event. Once the interrupt signal is received and the condition is handled, the machine can resume its previous operation. This allows for real-time processing and responsiveness to critical signals or alarms within industrial automation systems.

Understanding this concept is vital, as it highlights how programmable controllers can efficiently manage tasks and respond to external signals, thus ensuring that processes are continuously monitored and controlled effectively. The other terms do not capture this specific behavior; for instance, "Restart" implies starting the machine anew rather than temporarily stopping to address a signal, "Halt" indicates a complete stop rather than a pause for input, and "Pause" may not necessarily involve the input signal that characterizes the interrupt function.