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S7-1500T功能庫系列簡介之動態生成Cam曲線

發表時間:2018-12-25 09:28

概述


隨著西門子新一代運動控制S7-1500T在各行各業中的的廣泛應用,為了提高其可用性、提高工程師的編程效率并使項目規范化,西門子提供了一些常用的庫程序供用戶使用,使用標準的功能庫程序有如下優點:

1) 縮短工程師編程以及調試的時間,降低維護難度

2) 可使用各種編程語言調用標準功能庫

3) 標準功能庫程序在編寫時使用了高標準編程規范以及嚴格的功能測試和檢查

4) 在西門子支持網站上功能庫程序會不斷升級

5) 可打開源程序以便添加適合自已的需求的功能

6) 提供應用示例和使用文檔,簡單易用

7) 免費提供給用戶


介紹一下使用最廣泛的通過編程來動態生成凸輪曲線的功能塊  “LCamHdl_CreateCamBasic”及“LCamHdl_CreateCamAdvanced”。


在機器的運行中,有很多通過編程來實現凸輪曲線的創建和修改的需求,以適應生產的需要。為了方便用戶,西門子提供了生成凸輪曲線的庫文件“LCamHdl”,它提供了兩種功能塊 “LCamHdl_CreateCamBasic” 及 “LCamHdl_CreateCamAdvanced”,分別用于生成基本的凸輪曲線及符合VDI 2143的高品質和無抖動的凸輪曲線。



(1)“LCamHdl_CreateCamBasic”功能塊

       在程序運行時定義Cam曲線中的點及動態響應,運動過渡均通過直線及5次多項式進行連接。使用此功能塊創建Cam曲線,很容易處理生產機器最常用的凸輪輪廓,如圖1所示Cam曲線是由8個點,通過此功能塊來生成的。

8個點生成的Cam曲線

                              圖1 8個點生成的Cam曲線



(2)“LCamHdl_CreateCamAdvanced”功能塊

      功能塊支持用戶創建符合VDI 2143的高品質和無抖動的凸輪曲線,功能塊自動完成規格化計算。用戶需要提供曲線的起點和終點坐標以及根據具體的需求提供起始和結束點的動態響應參數,即一階導數或者二階導數數值。

通過功能塊生成的4個線段的Cam曲線

                                                                   圖2通過功能塊生成的4個線段的Cam曲線

在實際工程項目中可能會需要通過程序生成多個Cam曲線,根據需要進行Cam曲線的切換,且在HMI上顯示需要的Cam曲線,為了方便工程師實現這些功能,西門子也提供了相應的功能庫及示例項目。


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