4100-232-L現(xiàn)貨;
4100-232-L供應(yīng)。
組成模塊
PLC的結(jié)構(gòu)雖有箱體及模塊式之分,但從質(zhì)上看,箱體也是模塊,只是它集成了更多的功能。在此,不妨把PLC的模塊組成當(dāng)作所有PLC的結(jié)構(gòu)性能。
這個(gè)性能含義是指某型號(hào)PLC具有多少種模塊,各種模塊都有什么規(guī)格,并各具什么特點(diǎn)。
一般講,規(guī)模大的PLC,檔次高的PLC模塊的種類(lèi)也多,規(guī)格也多,反映它的特點(diǎn)的性能指標(biāo)也高。但模塊的功能則單一些。相反,小型PLC、檔次低的PLC模塊種類(lèi)也少,規(guī)格也少,指標(biāo)也低。但功能則多樣些,以至于集成為箱體。
組成PLC的模塊是PLC的硬件基礎(chǔ),只有弄清所選用的PLC都具有那些模塊及其特點(diǎn),才能正確選用模塊,去組成一臺(tái)完整的PLC,以滿足控制系統(tǒng)對(duì)PLC的要求。
常見(jiàn)的PLC模塊有:
CPU模塊,它是PLC的硬件核心。PLC的主要性能,如速度、規(guī)模都由它的性能來(lái)體現(xiàn)。
電源模塊,它為PLC運(yùn)行提供內(nèi)部工作電源,而且,有的還可為輸入信號(hào)提供電源。
I/O模塊,它集成了I/O電路,并依點(diǎn)數(shù)及電路類(lèi)型劃分為不同規(guī)格的模塊。
內(nèi)存模塊,它主要存儲(chǔ)用戶(hù)程序,有的還為系統(tǒng)提供輔加的工作內(nèi)存。在結(jié)構(gòu)上內(nèi)存模塊都是附加于CPU模塊之中。
底板、機(jī)架模塊,它為PLC各模塊的安裝提供基板,并為模塊間的聯(lián)系提供總線。若干底板間的聯(lián)系有的用接口模塊,有的用總線接口。不同廠家或同一廠家但不同類(lèi)型的PLC都不大相同。
箱體式的小型PLC的主箱體就是把上述幾種模塊集成在一個(gè)箱體內(nèi)的,并依可能提供I/O點(diǎn)數(shù)的多少,劃分為不同的規(guī)格。
箱體式的PLC還有I/O擴(kuò)展箱體,它不含CPU,僅有電源及I/O單元的功能。擴(kuò)展箱體也依I/O點(diǎn)數(shù)的多少劃分有不同的規(guī)格。
4) 失之東隅,收之桑榆。(范曄(后漢書(shū)·馮異傳))
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