The principal drawback to these devices has been the steep learning curve and inherent difficulty with program maintenance using their traditional RLL ( Relay Ladder Logic) programming language. Available programming resources include variables, timers, and counters. In between the inputs and outputs is a control program that determines which outputs are activated when certain combinations of inputs are received.
They can have multiple relay, analog, and serial outputs to control lights, motors, sound effects, etc. These general-purpose control devices can accept a number of inputs from such devices as pushbuttons, motion detectors, joysticks, etc. PLC's ( Programmable Logic Controllers) are a very useful control solution for a variety of exhibit and interactive applications. Courtesy of: Conceptron Associates Introduction
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