... systems for North Sea oil/gas rigs have evolved from earlier versions which were implemented in hardwired relay logic. ... to the required states of a large number of shut-down devices such as motorised valves, electrical contactors and motor starters, etc. ... Programming is sub-contracted to the equipment manufacturer, who uses the main design contractora#39;s a#39;matrix diagramsa as his specification.
|Title||:||Microprocessors in Process Control|
|Author||:||J. R. Borer, J. Borer|
|Publisher||:||Springer Science & Business Media - 1991-08-31|