Which mode enables automatic operations in a PLC program?

Which mode enables automatic operations in a PLC program?

• A. Manual mode
• B. Semi-automatic mode
• C. Automatic mode
• D. Disabled

Answer: (C)

Automatic mode is the setting that lets the PLC run its control program and manage outputs without requiring ongoing operator commands. In this mode, the PLC continuously performs a scan cycle: it reads inputs from sensors, evaluates the control logic, and updates the outputs accordingly. This enables the process to operate automatically based on the programmed rules, timers, counters, and interlocks. Manual mode relies on direct operator actions to drive outputs, semi-automatic mixes manual steps with automatic steps, and disabled stops the program and typically turns outputs off for safety. So automatic mode is the one that enables automatic operations.

Automatic mode is the setting that lets the PLC run its control program and manage outputs without requiring ongoing operator commands. In this mode, the PLC continuously performs a scan cycle: it reads inputs from sensors, evaluates the control logic, and updates the outputs accordingly. This enables the process to operate automatically based on the programmed rules, timers, counters, and interlocks. Manual mode relies on direct operator actions to drive outputs, semi-automatic mixes manual steps with automatic steps, and disabled stops the program and typically turns outputs off for safety. So automatic mode is the one that enables automatic operations.