Carrier PC211 specifications Controls, Digital Signal

Controls

Definitions

Analog Signal

An analog signal varies in proportion to the monitored source. It quantifies values between operating limits. (Example: A temperature sensor is an analog device because its resistance changes in proportion to the temperature, generating many values.)

Digital Signal

A digital (discrete) signal is a 2-position representation of the value of a monitored source. (Example: A switch is a digital device because it only indicates whether a value is above or below a set point or boundary by generating an on/off, high/low, or open/closed signal.)

Volatile Memory

Volatile memory is memory incapable of being sustained if power is lost and subsequently restored.

CAUTION ! CAUTION

The memory of the PSIO and LID modules are volatile. If the battery in a module is removed or damaged, all programming will be lost.