6ES7390-1AE80-0AA0 導軌(480mm)
6ES7390-1AE80-0AA0
(1)系統聯機前要進行組態,即確定系統管理的I/O點數,輸入寄存器、保持寄存器數、通信端口數及其參數、I/O站的匹配及其調度方法、用戶占用的邏輯區大小,等等。組態一經確認,系統便按照的約束規則運行。重新組態時,按原組態的約定生成的程序將不能在新的組態下運行,否則會引起系統錯亂。因此,第一次組態時要慎重,I/O站、I/O點數,寄存器數、通道端口數、用戶存儲空間等均要留有余地,考慮到近期的發展。但是,I/O站、I/O點數、寄存器數、端口數等的設置,都要占用的內存,同時延長掃描時間,降低運行速度。因此,余量又不能留得太多。特別要引起注意的是運行中的系統不能重新組態。
(2)對于大中型PLC機來說,由于CPU對程序的掃描是分段進行的,每段程序分段掃描完畢,即更新一次I/O點的狀態,因而大大提高了系統的實時性。但是,若程序分段不當,也可能引起實時性降低或運行速度減慢的問題。分段不同將顯著影響程序運行的時間,特別是對于個別程序段特長的情況尤其如此。一般地說,理想的程序分段是各段程序有大致相當的長度。
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