Abstract: A simulator can simulate a multi-stage industrial plant that is controllable by a digital control and digital programmer for affecting plant operation. The simulator has a plurality of indicators mounted on a console for producing indications in response to display signals applied to the indicators. Also, a plurality of manually operated controls are mounted on the console for allowing production of manual signals. The simulator also has a computer coupled to the indicators for providing to them their display signals. The computer is also coupled to the manually operable controls for receiving their manual signals. The computer can respond to the manual signals of predetermined ones of the manually operable controls to provide a programmed array of processed values sized to simulate parameters existing during operation of the industrial plant. Given ones of this array of values are applied to specified ones of the indicators for providing their indication.