為什么工控界更信任PLC,選擇PLC作為工控的核心部件呢,主要是由于PLC的以下五個特點:
1. 可靠性高,抗干擾能力強
無觸點控制:故障率少;
硬件措施:屏蔽、濾波、隔離;
軟件措施:故障檢測、信息保護和恢復、警戒時 鐘(死循環報警)、程序檢驗
2. 使用靈活,通用性強
產品系列化,硬件結構模塊式,可靈活選用;
軟接線邏輯使得PLC能簡單輕松的實現各種不同的控制任務,且系統設計周期短。
3. 編程方便,易于掌握
采用與繼電器電路 為相似的梯形圖語言,直觀易懂, SFC 功能圖,使編程更簡單方便。
4. 接口簡單,維護方便
可直接與現場強電設備相連接,接口電路模塊化。
有完善的自診斷及監視功能,便于查出故障原因,并迅速處理。
5. 功能完善,性價比高
除邏輯控制,定時計數,數字運算外,配合特殊功能模塊還可以實現點位控制, PID 運算,過程控制,數字控制等功能,還可與上位機通信,遠程控制等。
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