イグチ　ユキヒロ   Iguchi Yukihiro   井口　幸洋    所属   明治大学  理工学部    職種   専任教授
言語種別	英語
発行・発表の年月	2012/11
形態種別	国際会議議事録
標題	A realization method of fast and dependable programmable logic controllers
執筆形態	共著(筆頭者以外)
掲載誌名	Proc. of WRTLT'12
著者・共著者	R. Kawaguchi, Y. Yamada, K. Takahashi, Y. Urano, Y. Iguchi
概要	This paper proposes a realization method of fast and dependable PLCs (programmable logic controllers). Many functions in PLCs consist of combinations of logic instructions. We can express them using logic functions. Meanwhile all four-variable logic functions are classified into 222 equivalence classes by the NPN-equivalence relation. We store their 222 functions into a memory block by a truth table. We call it ``4-input universal logic memory (4-ULM)". We propose high-speed PLC emulators having many 4-ULMs (4-input universal logic, which can emulate PLCs with just memory accessing. We can realize 100--200 times faster PLC emulators than a commercial PLC. This paper also proposes how to realize the dependability.