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 exe...
详细信息
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 provided calculation condition for this part has changed since last time. There 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.
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