AB MSR220P 继电器
执行时间短可加快PLC对一般输入信号的响应速度。从讨论PLC的工作原理知,从对PLC加入输入信号,到PLC产生输出,理想的情况也要延迟一个PLC运行程序的周期。因为PLC监测到输入信号,经运行程序后产生的输出,才是对输入信号的响应。不理想时,还要多延长一个周期。当输入信号送入PLC时,PLC的输入刷新正好结束,就是这种情况。这时,要多等待一个周期,PLC的输入映射区才能接受到这个新的输入信号。对一般的输入信号,这个延迟虽可以接受,但对急需响应的输入信号,就不能接受了。对急需处理的输人信号延迟多长时间PLC能予以响应,要另作要求。 为了处理急需响应的输入信号,PLC有种种措施。不同的PLC措施也不完全相同,提高响应速度的效果也不同。一般的作法是采用输入中断,然后再输出即时刷新,即中断程序运行后,有关的输出点立即刷新,而不等到整个程序运行结束后再刷新。 这个效果可从两个方面来衡量:一是能否对几个输入信号作快速响应;二是快速响应的速度有多快。多数PLC都可对一个或多个输入点作快速响应,快速响应时间仅几个毫秒。性能高的、大型的PLC响应点数更多。 工作速度关系到PLC对输入信号的响应速度,是PLC对系统控制是否及时的前提。控制不及时,就不可能准确与可靠,特别是对一些需作快速响应的系统。这就是把工作速度作为PLC指标的原因。
ALLEN BRADLEY 8520-CPUX1 8520CPUX1
ALLEN BRADLEY 8520-4APA1 SERIES C * OUT OF BOX*
ALLEN BRADLEY 8500-E1F-K1B 8500E1FK1B
ALLEN BRADLEY 8410-MPNL 8410MPNL
ALLEN BRADLEY 6180-ADIDCFBCCZZ 6180ADIDCFBCCZZ
ALLEN BRADLEY 5370-CVIMC 5370CVIMC
Allen Bradley 5370 Configurable vision processor module 5370-CVIM2 Ser A Rev C
ALLEN BRADLEY 5250-MLP1 5250MLP1
Allen Bradley 520F-EODX2 2 Speed Starter Size 3 & 4 110-120 VAC 509-DOD 520F-EOD
ALLEN BRADLEY 501560 501560
ALLEN BRADLEY 500-GOB-930 500GOB930
Allen Bradley 4160V Vacuum Contactor 1502-V4DBDA
ALLEN BRADLEY 4100-214-R 4100214R
ALLEN BRADLEY 4100-212-R 4100212R
ALLEN BRADLEY 2750-AH 2750AH
ALLEN BRADLEY 2711-T9C8 2711T9C8
ALLEN BRADLEY 2711-T10G8 2711T10G8
ALLEN BRADLEY 2711-T10G3 2711T10G3
ALLEN BRADLEY 2711-T10G20 2711T10G20
ALLEN BRADLEY 2711-T10C3 -- 2711T10C3
ALLEN BRADLEY 2711-T10C1L1 2711T10C1L1
ALLEN BRADLEY 2711-T10C10 -- 2711T10C10
ALLEN BRADLEY 2711P-T15C6D1 2711PT15C6D1
ALLEN BRADLEY 2711P-T15C4D1 2711PT15C4D1
ALLEN BRADLEY 2711P-T12C4D2 2711PT12C4D2
ALLEN BRADLEY 2711P-T12C4A8 2711PT12C4A8
ALLEN BRADLEY 2711P-T10C4A2 2711PT10C4A2
ALLEN BRADLEY 2711P-K12C4D1 SER.G PANEL VIEW PLUS MODULE * OUT OF A BOX*
Allen Bradley 2711P-K12C4D1 PanelView plus 1250 with 12 month warranty
ALLEN BRADLEY 2711P-B12C6D7 2711PB12C6D7
ALLEN BRADLEY 2711P-B10C4A1 2711PB10C4A1
ALLEN BRADLEY 2711-K10C20 SERIES E PANEL VIEW 1000, 100-240VAC,, *
ALLEN BRADLEY 2711E-K10C6 SERIES D REV A FRN 5.14 PANELVIEW * OUT OF BOX*
ALLEN BRADLEY 2711-B6C20L1 2711B6C20L1
ALLEN BRADLEY 2711-B6C1 2711B6C1
ALLEN BRADLEY 22C-D170A103 SER A POWERFLEX 400 AC DRIVE 480VAC 3PH 125HP *XLNT*
ALLEN BRADLEY 20G11ND065AA0NNNNN SER A POWERFLEX DRIVE * IN A BOX*
ALLEN BRADLEY 20G11ND065AA0NNNNN 20G11ND065AA0NNN
ALLEN BRADLEY 20DC205 A 3 ENNA1NN A 125-150 HP 342-528V PowerFlex 700S Series A
ALLEN BRADLEY 20BE077A0AYNANDO SERIES B **
ALLEN BRADLEY 20BD180A3A22ACA0 SER A POWERFLEX AC DRIVE 3PH 480V 150HP **XLNT**
ALLEN BRADLEY 20BD156A0AYNANA0 /A POWERFLEX 700 125HP *FREE SHIPPING
ALLEN BRADLEY 20BD125A3ANNAND0 SERIES B DRIVE **
ALLEN BRADLEY 20BD077A3ANNANC0NNAD 20BD077A3ANNANC0
ALLEN BRADLEY 1794-L34 1794L34
ALLEN BRADLEY 1785-V80B 1785V80B
ALLEN BRADLEY 1785-V30B 1785V30B
Allen Bradley 1785-L80C15/F Controlnet Processor Module
ALLEN BRADLEY 1785-L80C 1785L80C
ALLEN BRADLEY 1785-L60B 1785L60B
ALLEN BRADLEY 1785-L40L SERIES E MODULE * OUT OF BOX*
ALLEN BRADLEY 1785-L40B/E 1785L40BE
ALLEN BRADLEY 1785-L30B 1785L30B
ALLEN BRADLEY 1785-L20E/E 1785L20EE
ALLEN BRADLEY 1785-KE 1785KE
ALLEN BRADLEY 1784-T30G PLANT FLOOR TERMINAL 9 INCH GREEN ***XLNT***
ALLEN BRADLEY 1779-KFM 1779KFM
ALLEN BRADLEY 1775-S5 1775S5
Allen Bradley 1775-MEA/B Error Correcting Ram 1775MEAB 96242471
ALLEN BRADLEY 1775-KA 1775KA
ALLEN BRADLEY 1771-NIVT 1771NIVT
ALLEN BRADLEY 1771-DMC4 1771DMC4
ALLEN BRADLEY 1771-CFMK 1771CFMK
ALLEN BRADLEY 1770-M11 1770M11
ALLEN BRADLEY 1756-RM 1756RM
ALLEN BRADLEY 1756-L75 -- 1756L75
ALLEN BRADLEY 1756-L72 1756L72
ALLEN BRADLEY 1756-L63S -FS- 1756L63S
ALLEN BRADLEY 1756-L62 1756L62
ALLEN BRADLEY 1756-L61 1756L61
ALLEN BRADLEY 1756-L60M03SE 1756L60M03SE
ALLEN BRADLEY 1756-HIST1G -FS- 1756HIST1G
ALLEN BRADLEY 1747-L552 1747L552
ALLEN BRADLEY 150-F201-NBD 150F201NBD
ALLEN BRADLEY 150-B97NBR 150B97NBR
ALLEN BRADLEY 150-B97NBDB 150B97NBDB
ALLEN BRADLEY 150-B97NBD 150B97NBD
ALLEN BRADLEY 150-A360NBD-8B4 SMART MOTOR CONTROLLER SER. B 200-480VAC 360A