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An Industrial Microprocessor System

出版	1978
URL	http://books.google.com.hk/books?id=v4gijwEACAAJ&hl=&source=gbs_api

註釋This report describes work done in 1974 to 1976 on the design and construction of an industrial microprocessor system capable of testing the limits and capabilities of microprocessors in the industrial process-control world. The system had to be capable of operating in a data-logging or in a control or supervisory capacity. It was intended to provide a low-cost reliable alternative to expensive process-control and data-logging systems based on minicomputers, which are under-utilized in many applications. The system consists of a robust, electrically isolated unit designed on the 'black-box' principle with the minimum of operator controls. It is housed in a sealed crate with internal access by way of rows of input and output plugs and connecters. The system is modular so that it can easily be expanded. It can be operated as a small dedicated controller or expanded to its full capacity by the addition of memory or industrial input-output modules. The system is based on the Intel 8080 microprocessor. The industrial interface consists of electrically isolated analogue- and digital-input and -output modules, which can be selected under programme control. There are also up to 64 asynchronous priority-encoded alarm channels that can interrupt the control sequence at any time should an alarm condition arise. A plug-in-front-panel unit is provided for the debugging of hardware and software.