二．PLC與繼電器控制系統(tǒng)、微機區(qū)別
1．PLC與繼電器控制系統(tǒng)區(qū)別
前者工作方式是“串行”，后者工作方式是“并行”。
前者用“軟件”，后者用“硬件”。
2．PLC與微機區(qū)別
前者工作方式是“循環(huán)掃描”。后者工作方式是“待命或中斷”
PLC 編程方式
PLC最突出的優(yōu)點采用“軟繼電器”代替“硬繼電器”。用“軟件編程邏輯”代替“硬件布線邏輯”。
PLC編程語言有梯形圖、布爾助記符語言，等等。尤其前兩者為常用。
梯形圖語言特點：
1．每個梯形圖由多個梯級組成。
2．梯形圖中左右兩邊的豎線表示假想的邏輯電源。當某一梯級的邏輯運算結(jié)果為“1”時，有假想的電流通過。
3．繼電器線圈只能出現(xiàn)一次，而它的常開、常閉觸點可以出現(xiàn)無數(shù)次。
4．每一梯級的運算結(jié)果，立即被后面的梯級所利用。
5．輸入繼電器受外部信號控制。只出現(xiàn)觸點，不出現(xiàn)線圈廈門潤星貿(mào)易有限公司：主營產(chǎn)品
DCS集散式控制系統(tǒng)、PLC可編程控制器、數(shù)控系統(tǒng)、（CPU處理器、模塊、卡件、控制器、伺服驅(qū)動、驅(qū)動器、馬達電機、 內(nèi)存卡、 電源，機器人備件等）各類工控備品備件產(chǎn)品。
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