Terminology

The language of PLCs consists of a commonly used set
of terms; many of which are unique to PLCs. In order to
understand the ideas and concepts of PLCs, an understanding
of these terms is necessary.

Sensor
Actuators
Discrete Input
Analog Inputs
Discrete Outputs
Analog Outputs
CPU
Programming
Ladder Logic
Ladder Logic Diagram
Statement list
Function Block Diagrams
PLC Scan
Software
Hardware
Memory Size
RAM
ROM
EPROM
Firmware