The forcing function of a PLC allows the user to turn an external input or output on or off:

A) according to the forced program.
B) according to the main program.
C) from the keyboard regardless of its actual status.
D) all of these.

Forcing Function

An external factor or input that compels a system to change its state or behavior, often used in mathematical modeling and simulations.

PLC

Stands for Programmable Logic Controller, a digital computer used for automation of industrial processes, such as control of machinery on factory assembly lines.

External Input

Any input signal or data received from an outside source, device, or system, which is used to influence operations or responses within a system.