所属 明治大学 理工学部 職種 専任教授
|標題||A realization method of fast and dependable programmable logic controllers|
|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.