Selecting automatic mode causes the PLC program to enable the _________ functions.

Selecting automatic mode causes the PLC program to enable the _________ functions.

• A. Manual functions
• B. Diagnostic functions
• C. Safety functions
• D. Automatic functions

Answer: (D)

Automatic mode loads and runs the PLC’s programmed control logic to manage the process. When this mode is selected, the outputs are driven by the automatic control routines in the ladder logic (sequencing, interlocks, setpoints, timers, etc.) in response to sensor signals, rather than being manually overridden by an operator. Manual mode would hand control to human inputs, while diagnostic mode is for checking hardware or software, and safety aspects are typically handled by dedicated interlocks and routines—often still active within the automatic logic but not the defining feature of the mode itself.

Automatic mode loads and runs the PLC’s programmed control logic to manage the process. When this mode is selected, the outputs are driven by the automatic control routines in the ladder logic (sequencing, interlocks, setpoints, timers, etc.) in response to sensor signals, rather than being manually overridden by an operator. Manual mode would hand control to human inputs, while diagnostic mode is for checking hardware or software, and safety aspects are typically handled by dedicated interlocks and routines—often still active within the automatic logic but not the defining feature of the mode itself.