IC693ACC310 IC693ACC310 IC693ACC310 IC693ACC310
PLC的應用
目前，PLC在國內外已廣泛應用于鋼鐵、石油、化工、電力、建材、機械制造、汽車、輕紡、交通運輸、環保及文化娛樂等各個行業，隨著其性能價格比的不斷提高，應用的范圍還在不斷擴大，PLC的應用大致可歸納為以下幾類。
1)、開關量的邏輯控制
這是PLCzui基本、zui廣泛的應用領域。PLC的邏輯控制取代傳統的繼電系統控制電路，實現邏輯控制、順序控制，既可用于單機控制，也可用于多機群控及自動化生產線的控制等。如機床電氣控制、裝配生產線、電梯控制、冶金系統的高爐上料系統以及各種生產線的控制。
2)、運動控制
PLC可以用于圓周運動或直線運動的控制。目前，大多數的PLC制造商都提供拖動步進電機或伺服電機的單軸或多軸位置控制模塊，這一功能可廣泛用于各種機械，如金屬切削機床、金屬成型機床、機器人、電梯等。
3)、過程控制
過程控制是指對溫度、壓力、流量、速度等連續變化的模擬量的閉環控制。PLC采用相應的A/D和D/A轉換模塊及各種各樣的控制算法程序來處理模擬量，完成閉環控制。PID調節是一般閉環控制系統中用得較多的一種調節方法。過程控制在冶金、化工、熱處理、鍋爐控制等場合有非常廣泛的應用。現代的大、中型PLC一般都有閉環PID控制模塊，這一功能可以用PID子程序來實現，而更多的是使用PID模塊來實現。
手機
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鄭娟萍
廈門仲鑫航自動化設備有限公司
4)、數據處理
PLC具有數學運算（含矩陣運算、函數運算、邏輯運算）、數據傳送、數據轉換、排序、查表、位操作等功能，可以完成數據的采集、分析及處理。這些數據可以通過通信接口傳送到的智能裝置進行處理，或將它們打印備用。數據處理一般用于大型控制系統，如造紙、冶金、食品工業中的一些大型控制系統。
5）、通信及聯網
PLC通信括PLC相互之間、PLC與上位機、PLC與其它智能設備間的通信。PLC與其它智能控制設備一起，可以構成“集中管理、分散控制”的分布式控制系統，滿足工廠自動化系統發展的需要。
● PLC控制系統與繼電器控制系統的區別 ：
⑴ 組成器件不同：繼電器控制線路是許多真正的硬件繼電器組成，而梯形圖則由許多所謂“軟繼電器”組成。
⑵ 觸點數量不同：硬繼電器的觸點數量有限，用于控制的繼電器的觸 點數一般只有4～8對；而梯形圖中每個“軟繼電器”供編程使用的觸點數有無限對。
⑶ 實施控制的方法不同：在繼電器控制線路中，實現某種控制是通過各種繼電器之間硬接線解決的。而PLC控制是通過梯形圖即軟件編 程解決的。
⑷ 工作方式不同：在繼電器控制線路中，采用并行工作方式；而在梯形圖的控制線路中，采用串行工作方式。BENTLY NEVADA 3300/35-04-02-02-00-00 SIX CHANNEL TEMPERATURE MONITOR NEW NO BOX
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