ABB PP845
咨詢熱線--17750626260
為了處理急需響應(yīng)的輸入信號,PLC有種種措施。不同的PLC措施也不完全相同,提高響應(yīng)速度的效果也不同。一般的作法是采用輸入中斷,然后再輸出即時(shí)刷新,即中斷程序運(yùn)行后,有關(guān)的輸出點(diǎn)立即刷新,而不等到整個(gè)程序運(yùn)行結(jié)束后再刷新。
這個(gè)效果可從兩個(gè)方面來衡量:一是能否對幾個(gè)輸入信號作快速響應(yīng);二是快速響應(yīng)的速度有多快。多數(shù)PLC都可對一個(gè)或多個(gè)輸入點(diǎn)作快速響應(yīng),快速響應(yīng)時(shí)間僅幾個(gè)毫秒。性能高的、大型的PLC響應(yīng)點(diǎn)數(shù)更多。
工作速度關(guān)系到PLC對輸入信號的響應(yīng)速度,是PLC對系統(tǒng)控制是否及時(shí)的前提??刂撇患皶r(shí),就不可能準(zhǔn)確與可靠,特別是對一些需作快速響應(yīng)的系統(tǒng)。這就是把工作速度作為PLC指標(biāo)的原因。
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ALLEN BRADLEY SURGE SUPPRESSOR LOT OF 5 700-HSMD SERIES A
OKAYA SURGE PROTECTOR 781BXZ-2A
ALLEN BRADLEY 12-250VDC SURGE SUPPRESSOR SER.A LOT OF 2 100-FSD250 99624
ALLEN BRADLEY 110-280VAC SURGE SUPPRESSOR SER.A LOT OF 5 100-FSC280 99616
RELIANCE ELECTRIC 5A 240VDC SURGE SUPPRESSOR NIB 600686-25RR 48F
SOLA 120V 400VPK 0-135VRMS SURGE SUPRESSOR STV25K-10SDIN
COOPER VARISTAR SURGE ARRESTER 20853025640 08 UTO1008085BC11
ALLEN BRADLEY SURGE SUPPRESSOR 136VAC 180VDC 100-FSV136 SER A
GENERAL ELECTRIC 3POLE MW60 MOD 2 SWITCH THMC32
HONEYWELL LIMIT SWITCH 250V NIB 914CE1-3
ALLEN BRADLEY GUARDMASTER CADET SAFETY SWITCH IEC 947-5-1
HONEYWELL MICRO LIMIT SWITCH 15A 125/250/480VAC BZE6-2RQ
TURCK 10-65VDC 200MA 20MM PROXIMITY LIMIT SWITCH NI20-CK40-VP4X2?-H1141
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HONEYWELL 600VAC 10A MICRO SWITCH LSYAB1A
UNIMAX LIMIT SWITCH NNB 2HB-5
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MICRO SWITCH 600VAC 10A LIMIT SWITCH LSV6B 102687
ALLEN BRADLEY SAFETY LIMIT SWITCH 230V 3A IEC 947-5-1 CM BS5304 IP66
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SQUARE D LIMIT SWITCH 9007C54FP10Y190?21
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REES INC. 2-1/4" HEAVY DUTY MUSHROOM PLUNGER SWITCH, 00662-003 *NEW*
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