PLC是一種用于工業(yè)生產(chǎn)自動化控制的設備,一般不需要采取什么措施,就可以直接在工業(yè)環(huán)境中使用。然而,盡管有如上所述的可靠性較高,抗干擾能力較強,但當生產(chǎn)環(huán)境過于惡劣,電磁干擾特別強烈,或安裝使用不當,就可能造成程序錯誤或運算錯誤,從而產(chǎn)生誤輸入并引起誤輸出,這將會造成設備的失控和誤動作,從而不能保證PLC的正常運行。要提高PLC控制系統(tǒng)可靠性,一方面要求PLC生產(chǎn)廠家提高設備的抗干擾能力;另一方面,要求設計、安裝和使用維護中引起高度重視,多方配合才能完善解決問題,有效地增強系統(tǒng)的抗干擾性能。因此在使用中應注意以下問題:
(1)溫度:PLC要求環(huán)境溫度在0~55℃,安裝時不能放在發(fā)熱量大的元件下面,四周通風散熱的空間應足夠大。
(2)濕度:為了保證PLC的絕緣性能,空氣的相對濕度應小于85%(無凝露)。
(3)震動:應使PLC遠離強烈的震動源,防止振動頻率為10~55 Hz的頻繁或連續(xù)振動。當使用環(huán)境不可避免震動時,必須采取減震措施,如采用減震膠。
(4)空氣:避免有腐蝕和易燃的氣體,例如化學的酸堿等。對于空氣中有較多粉塵或腐蝕性氣體的環(huán)境,可將PLC安裝在封閉性較好的控制室或控制柜中。例如電廠的干排渣、干除灰等,在基建后期增加了封閉小屋。
(5)電源:PLC對于電源線帶來的干擾具有一定的抵制能力。在可靠性要求很高或電源干擾特別嚴重的環(huán)境中,可以安裝一臺帶屏蔽層的隔離變壓器,以減少設備與地之間的干擾。一般PLC都由直流24 V輸出提供給輸入端,當輸入端使用外接直流電源時,應選用直流穩(wěn)壓電源。因為普通的整流濾波電源,由于紋波的影響,容易使PLC接收到錯誤信息。
◆ 企業(yè)名稱:廈門興潤星貿(mào)易有限公司
◆ 企業(yè)性質(zhì): 有限責任公司
◆ 主營業(yè)務:DCS,PLC
◆ 經(jīng)營模式: 貿(mào)易
◆ 貿(mào)易地區(qū): 全國
◆ 聯(lián)系人:陽先生
◆ 商務電話:0592-6895320
◆ 聯(lián)系手機:18030263579
◆ 商務QQ:1529928696
◆ 傳真:0592-6034581 (備注“0028”收)
◆ E-mail:1529928696@qq.com
◆ 旺旺:xmxrx0028
◆ 郵政編碼:361000
本公司主營產(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、工作站、驅(qū)動器、
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General Electric IC693ADC420A
General Electric IC693ALG220
General Electric IC693ALG222
General Electric IC693ALG390
General Electric IC693ALG391
General Electric IC693ALG392
General Electric IC693APU300
General Electric IC693BEM331
General Electric IC693CBL300
General Electric IC693CBL305A
General Electric IC693CHS391
General Electric IC693CHS392
General Electric IC693CHS393
General Electric IC693CMM301
General Electric IC693CMM321
General Electric IC693CPU313P
General Electric IC693CPU331
General Electric IC693CPU340
General Electric IC693CPU341
General Electric IC693CPU360
General Electric IC693MDL230
General Electric IC693MDL240
General Electric IC693MDL390
General Electric IC693MDL641
General Electric IC693MDL645
General Electric IC693MDL654
General Electric IC693MDL740
General Electric IC693MDL741
General Electric IC693MDL930
General Electric IC693MDL940
General Electric IC693MDR390
General Electric IC693PCM301
General Electric IC693PCM311F
General Electric IC693PRG300
General Electric IC693PRG300
General Electric IC693PWR321
General Electric IC693PWR322
General Electric IC693PWR331
General Electric IC693UDR001HP1
General Electric IC693UDR001HP1
General Electric IC693UDR005RP1
General Electric IC697ALG230
General Electric IC697ALG441
General Electric IC697BEM711
General Electric IC697BEM713
General Electric IC697BEM731
General Electric IC697CPU731
General Electric IC697CPU782
General Electric IC697MDL240
General Electric IC697MDL250
General Electric IC697MDL350
General Electric IC697MDL940
General Electric IC697MEM733D
General Electric IC697MEM735B
General Electric IC697PCM711
General Electric IC697PWR710
General Electric IC697PWR711
General Electric IV630MDL375B
General Electric SRLA
General-Electric-IC600BF921
General-Electric-IC660BBA101
Giddings and Lewis 502-03518-02
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