It offers students excellent theories and wide applications of programmable logic controllers. The use of PLCs in automated production lines enhances system reliability, product quality, information sharing, efficiency and flexibility and thus educes costs. Designed with the latest microprocessor and electronic circuitry, today's compact-size PLCs provide the feature of high level of reliability, performance, speed and networking. This trainer enables students to learn step by step from the fundamentals of PLC to more advanced controls used in industry. Self-contained trainer which consists of a SIEMENS PLC main unit and commonly used I/O devices for simulation.