Fast Operating PLC Based on Event-Driven Control Program Tasks Execution

• Autorzy: Chmiel M. , Hryniewicz E. , Milik A.
• Konferencja: Digital Control Units Design ; 6.03.2009 ; Zielona Góra, Poland
• Języki publikacji: EN

Abstrakty

EN

The paper presents modified idea of program execution in PLCs. Instead of serial cyclic execution of control program event-driven execution is proposed. Suggested approach to program execution allows for selective execution of program parts or tasks. Only these blocks from entire program are executed whose variables have changed since last calculation. Proposed method can be implemented as software modification or as hardware accelerated solution. The most important part of the idea is task or subprogram triggering condition computation. Methods of program optimization are discussed. In order to determine program blocks that require recalculation in current program scan execution specific hardware support is planned to be researched. Memory content change detection unit allows to determine changes in memory content since last program block execution.

Słowa kluczowe

EN

programmable logic controller; central processing unit; control program; process image memory; scan time; throughput time

• Wydawca: Polish Academy of Sciences, Committee of Electronics and Telecommunication
• Czasopismo: Electronics and Telecommunications Quarterly
• Rocznik: 2009
• Tom: Vol. 55, No 2
• Strony: 269--286
• Opis fizyczny: Bibliogr. 12 poz., wykr.

Twórcy

autor

Chmiel M.

autor

Hryniewicz E.

autor

Milik A.

• Institute of Electronics, Silesian University of Technology, Gliwice,

Bibliografia

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