Real-Time Expansion of Software Programmable Logic Controllers
نویسندگان
چکیده
Fuji Electric is providing “SPS” as a software PLC (programmable controller) for the “MICREX-SX” series of integrated controllers. The SPS is a PLC operated on Windows NT*1, a general-purpose OS (operating system) for the PC (personal computer), and is well received because it shares the same programming language and development environment as the hardware PLC for the MICREX-SX. Realization of the PLC function on personal computers allows the development of applications utilizing the rich resources of personal computers and the merging of information technology (internet, intranet) with control technology, a recent trend. OSs widely used in personal computers are primarily intended for office use. The SPS, whose processing speed is sometimes inadequate for direct machine control, is mainly used in a management system one layer above. This paper introduces trends of software technology aimed at achieving an adequate processing speed for machine control and utilizing many of the rich and useful resources in personal computers and generalpurpose OSs.
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