Letter Pl

PLC Scan
A complete execution cycle of a programmable logic controller.
The PLC scan involves updating the status of inputs, executing
the user program, performing diagnostic and communication
functions, and updating the status of outputs. A PLC scan is
repetitively executed.

Plug-in Busway
Busway that incorporates plug-in units, called bus plugs, to
allow loads to be distributed over the length of the run.


Power

The rate at which work is done or energy is transformed. In
an electric circuit, power is measured in watts, or sometimes
in horsepower. The term power is also often used to refer to
electrical energy and as an adjective to describe devices or
circuits designed to carry a high level of current.

Power Factor
The ratio of true power to apparent power in a circuit. Power
factor is also equal to the cosine of the phase angle.