An invaluable guide to the application and use of programmable controllers. If you use PLCs or Programmable Electronic Systems then this book will explain the theoretical knowledge needed for modern process control applications, and give you practical help with the economic, maintenance and safety aspects. Concerned with the application and use of programmable controllers, it covers the range from simple relay replacement sequencing controllers costing a few hundred pounds to large distributed systems with analog PID control and extensive graphic facilities. Also covered are single board computer systems used for control purposes, and programmable instruments.