COMPUTER-TO-PROCESS INTERFACE IN JET's CONTROL AND DIAGNOSTIC SYSTEMS

The JET Control and Data Acquisition System, CODAS, uses some 40,000 electrical signals to control and monitor JET's various systems. This paper describes the electronic equipment and the data transmission techniques which are used to route these signals to and from the centrally-located computers. Special emphasis has been placed on the practical aspects of building and maintaining such a large system of approaching 8,000 modules. Quantities and costs of the various classes of modules and cables are given together with an outline of the quality assurance and organisational techniques adopted.