Abstract
Numerical control is the directing of a process through the execution of a pre-coded instruction sequence. Direct numerical control refers to the real-time control of machine tools by the direct coupling of a computer to one or more machine tool controllers. In this paper, a specific direct numerical control system is presented and the corresponding implementation issues are discussed. This system uses an HP/2100S mini comouter with a 16K main memory to control up to 16 machine tools. Blocks of information are sent upon request to the machine tools, via a common bus, and the status of the entire system is maintained in tables in order to enable the control program to keep track of each part program execution. The presentation of the system's hardware and software features is followed by a discussion of the host support system which consists of programs written for a CDC Cyber 74 computer to facilitate the development and maintenance of part program libraries. Several possible extensions to the system, including the incorporation of fault tolerance features, are pointed out in conclusion.
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