Which of the following is NOT one of the three main functions of a programmable controller?

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Multiple Choice

Which of the following is NOT one of the three main functions of a programmable controller?

The main concept being tested is the PLC scan cycle, which runs through three core activities: reading input statuses from sensors, evaluating the programmed logic, and updating the outputs that drive actuators. These steps happen repeatedly during normal operation to control processes in real time. Configuring I/O modules is not part of that runtime cycle. It’s a setup activity done during installation or reconfiguration—deciding which I/O modules to use, assigning addresses, wiring, and setting any module-specific parameters—so the PLC can correctly read inputs and drive outputs in its cycle. In other words, the three primary functions during each control cycle are reading inputs, evaluating logic, and updating outputs; configuring I/O modules prepares the system but does not constitute the ongoing control actions.

The main concept being tested is the PLC scan cycle, which runs through three core activities: reading input statuses from sensors, evaluating the programmed logic, and updating the outputs that drive actuators. These steps happen repeatedly during normal operation to control processes in real time.

Configuring I/O modules is not part of that runtime cycle. It’s a setup activity done during installation or reconfiguration—deciding which I/O modules to use, assigning addresses, wiring, and setting any module-specific parameters—so the PLC can correctly read inputs and drive outputs in its cycle. In other words, the three primary functions during each control cycle are reading inputs, evaluating logic, and updating outputs; configuring I/O modules prepares the system but does not constitute the ongoing control actions.

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