The Labtech Programmable Logic Controller Trainers are designed to work with most equipment that can be controlled by PLCS. However, Labtech has also developed special application training modules that interface quickly and easily with our PLC Trainers. These modules provide a variety of programming challenges for the student and are as economic as they are practical The system consists of a base station which provides a platform for the modules. The base station includes a number of switches, power supply and other control and signaling devices that can be used in conjunction with the modules for control, signaling or modification purposes.