Switch and relay contacts bounce on the contacts a few times before settling down to make a stable electrical connection. Debouncing is the act of removing or ignoring these initial on/off states.

See also: Alternating Current

A dedicated data register in memory that is used for temporary storage when doing calculations. See also: Address

See also: ADC, Analog to Digital Converter

See also: AD, Analog, Analog to Digital Converter

A code or number used to reference an area of memory in a PLC. See also: Accumulator

A software procedure used to solve a particular problem.

A current (and therefore voltage) that varies over time. Typical power supplies oscillate as sine waves at either 60Hz or 50Hz. Technically, at 60 Hz the current is reversing direction 60 times per se [..]

A value (such as voltage or current) which can be at any level between certain limits. With PLCs this typically refers to signals that range between 0 and 10 volts or 4 to 20mA. See also: ADC, Digital [..]

Analog to digital converter. A circuit or device that inputs an analog signal and converts it to a digital value. The resolution refers to number of bits used to indicate the analog value. See also: A [..]