ABB編程控制器di820
晶閘管輸出型:一般情況下，只能帶交流負載,響應速度快,動作頻率高;
晶體管輸出型:一般情況下，只能帶直流負載,響應速度快,動作頻率高;
繼電器輸出型:一般情況下，可帶交、直流負載,但其響應時間長,動作頻率低。
按結構型式分,PLC有哪幾種類型?各有什麼特點?
1）整體式:將CPU、電源、I/O部件都集中在一個機箱內,結構緊湊、價格低，一般小型PLC採用這種結構;
2）模塊式:將PLC的各個部分分成若幹個單獨的模塊,可根據需要選配不同模塊組成一個係統,具有配置靈活、方便擴展和維修的特點,一般中、大型PLC採用這種結構。模塊式PLC由框架或基板和各種模塊組成,模塊裝在框架或基板的插座上。
3）疊裝式：結合了整體式和模塊式的特點,疊裝式PLC的CPU、電源、I/O接口等也是各自獨立的模塊,但它們之間是靠電纜連接,使得係統不僅配置靈活而且體積小巧。
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