IC800SSI104RP2,IC800SSI104RP2,IC800SSI104RP2
十字路口雙向交通燈PLC自動控制系統軟硬件設計
十字路口雙向交通燈自動控制系統動作要求如時序圖所示。
2、思考問題
（1）．該控制系統是否屬于順序控制？是哪種結構？
PLC程序設計方法比較
下面將經驗設計法和順序控制設計法進行適當比較,以便設計時選用。
采用經驗設計法設計梯形圖時，不可能找出一種簡單通用的設計方法。
順序控制設計法將整個程序分成了控制程序和輸出程序兩個部分。由于步是根據輸出Y的狀態劃分的，所以M和Y之間具有很簡單的邏輯關系，輸出程序的設計極為簡單。而代表步的輔助繼電器或狀態繼電器的控制程序，不管多么復雜，其設計方法都是相同的，并且很容易掌握。
（2）．該控制系統工作步如何劃分？共有多少工作步？
（3）．輸入/輸出信號有那些？
3、信號分配
4、硬件設計
5、功能圖的繪制
6、梯形圖程序
7、指令程序
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