Support Systems for the Ontario Hydro Programmable Controller

Ontario Hydro has been developing a Programmable Controller System for power system applications which makes use of small but sophisticated programmable controllers for individual control loops. To facilitate the programming and testing of the resulting large number of controllers, a relatively powerful computer-based programming station and field testing unit have been developed. These provide all the basic support functions required, including entry of the logic arrangement, editing and compiling of " ladder diagrams", automatic drawing production, automatic controller programming and a testing/monitoring facility.