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PLC的工作方式为扫描加中断,这既可保证它能有序地工作,避免继电控制系统常出现的"冒险竞争",其控制结果总是确定的;而且又能应急处理急于处理的控制,保证了PLC对应急情况的及时响应,使PLC能可靠地工作。
为监控PLC运行程序是否正常,PLC系统都设置了"看门狗"(Watchingdog)监控程序。运行用户程序开始时,先清"看门狗"定时器,并开始计时。当用户程序一个循环运行完了,则查看定时器的计时值。若超时(一般不超过100ms),则报警。严重超时,还可使PLC停止工作。用户可依报警信号采取相应的应急措施。定时器的计时值若不超时,则重复起始的过程,PLC将正常工作。显然,有了这个"看门狗"监控程序,可保证PLC用户程序的正常运行,可避免出现"死循环"而影响其工作的可靠性。
PLC还有很多防止及检测故障的指令,以产生各重要模块工作正常与否的提示信号。可通过编制相应的用户程序,对PLC的工作状况,以及PLC所控制的系统进行监控,以确保其可靠工作。
PLC每次上电后,还都要运行自检程序及对系统进行初始化。这是系统程序配置了的,用户可不干预。出现故障时有相应的出错信号提示。
正是PLC在软、硬件诸方面有强有力的可靠性措施,才确保了PLC具有可靠工作的特点。它的均匀*时间可达几万小时以上;出了故障均匀修复时间也很短,几小时以至于几分钟即可。
曾有人做过为什么要使用PLC的问卷调查。在回答中,多数用户把PLC工作可靠作为选用它的主要原因,即把PLC能可靠工作,作为它的*指标。
2.4经济合算
*的使用必将带来巨大的社会效益与经济效益,这是科技是*生产力的体现,也是*生命力之所在。PLC也是如此。
尽管使用PLC*投资要大些,但从全面及长远看,使用PLC还是经济的。这是由于:
使用PLC的投资虽大,但它的体积小、所占空间小,辅助设施的投进少;使用时省电,运行费少;工作可靠,停工损失少;维修简单,维修费少;还可再次使用以及能带来附加价值等等,从中可得更大的回报。所以,在多数情况下,它的效益是可观的。
3. 基本应用
zui初,PLC主要用于开关量的逻辑控制。随着PLC技术的进步,它的应用领域不断扩大。
如今,PLC不仅用于开关量控制,还用于模拟量及数字量的控制,可采集与存储数据,还可对控制系统进行监控;还可联网、通讯,实现大范围、跨地域的控制与治理。PLC已日益成为产业控制装置家族中一个重要的角色。。
3.1用于开关量控制
PLC控制开关量的能力是很强的。所控制的进出点数,少的十几点、几十点,多的可到几百、几千,甚至几万点。由于它能联网,点数几乎不受限制,不管多少点都能控制。
所控制的逻辑题目可以是多种多样的:组合的、时序的;即时的、延时的;不需计数的,需要计数的;固定顺序的,随机工作的;等等,都可进行。
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DOUBLE ACTING 6 IN BORE HYDRAULIC CYLINDER B365988
VICEROY FLUID POWER 7KB6X12NC9-4 12 IN 6 IN HYDRAULIC C
ANKER-HOLTH 100124 DOUBLE ACTING 6 IN HYDRAULIC CYLINDE
PHD HVR13/1-1/2X2 2 IN STROKE 1-1/2 IN BORE HYDRAULIC C
PARKER 02.00 J2H-TS19A 2.500 2-1/2 IN 2 IN 3000PSI HYDR
HYDRO-LINE DOUBLE ACTING HYDRAULIC CYLINDER B307416
HYDRO-LINE LR5ED1.5X1 HYDRAULIC 3/8IN NPT 1IN X 1.5IN
NEW ENERPAC RSM-100 FLAT-JAC 12MM STROKE 42.9MM BORE HY
ATLAS 24IN-LENGTH DOUBLE ACTING 3-1/2 IN HYDRAULIC CYLI
PARKER J3LLUS14A 3 IN 3-1/4 IN 1030PSI HYDRAULIC CYLIND
SHEFFER 3-1/4MCH4-9/16 4-9/16IN STROKE 3-1/4IN BORE HYD
MARPOSS 3603296005 6ZD2973 SLIDE 4IN STROKE HYDRAULIC C
NEW SHEFFER 2.5MHC4CC 4 IN STROKE 2-1/2 IN BORE HYDRAUL
PARKER 2.00 J3LLTS34A 2.750 2-3/4IN STROKE 2IN BORE HYD
NEW PARKER 02.00 CD2HTS14AC 3.000 3IN STROKE 2IN BORE H
PARKER 3.25CHH-2HXKTVS?33AC-6.000 6IN 3-1/4IN 3000PSI HY
PARKER 01.50 CTC2HT19C 9.000 SERIES 2H 9IN 1-1/2IN HYDR
EATON 3HA5F-1.5X1 N-.63-2-N-N-M-1?-1 1IN STROKE 1-1/2IN
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NOMADS? DOUBLE ACTING 4 IN BORE 45IN LENGTH HYDRAULIC
10IN STROKE 2-3/4IN BORE HYDRAULIC CYLINDER D350139
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NEW A-1 MACHINE 6287 STEEL COMPLETE 4 IN HYDRAULIC CYLI
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MILWAUKEE 510-32-54-1 DOUBLE ACTING 10IN STROKE 2IN HYD
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PARKER CBB2HTS34AC DOUBLE ACTING 15 IN 3-1/4 IN HYDRAUL
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PARKER 02.00 BB2H TS24 15.00 15 IN 2 IN 3000PSI HYDRAUL
PARKER CD2HLT19AC 3 IN 2-1/2 IN 3000PSI DOUBLE ACTING H
BIMBA H-092-DBZ 500 2IN STROKE 1-1/16IN BORE HYDRAULIC
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LAMB-GRAYS 0358961 31 IN 2.5 IN 3000PSI DOUBLE ACTING H
PARKER LINEAR ACTUATING DOUBLE ACTING 15 IN 6 IN HYDRAU
BOSCH H160CA 450MM STROKE 63MM BORE HYDRAULIC CYLINDER
REXROTH MF2-PH 1.25IN STROKE 1IN BORE 1000PSI HYDRAULIC
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PARKER 01.50 BB2HLUS18A 4.125 2H 4.125 IN 3000PSI HYDRA
HYDRAULIC DOUBLE ACTING 16 IN 2-1/2 IN CYLINDER D208159
TRC HYDRAULICS 13750 4-1/4 IN DOUBLE ACTING HYDRAULIC C
PARKER 70H-8 1FA32BB126-BC-L 5IN STROKE 1-1/2IN BORE HY
PARKER 02.00 C092HKT14A 16.000 16 IN 2 IN 3000PSI HYDRA
PARKER 04.00 SB2HCTS13A 7.000 DOUBLE ACTING 7 IN 4 IN H
PARKER 03.25 CD2HLT34AC 10.00 10IN 3-1/4IN 3000PSI HYDR
MILLER FLUID POWER A86B2N 6 IN 4 IN 500PSI HYDRAULIC CY
PARKER BB2HLUS18A SERIES 2H 4.125 IN 1.50 IN 3000PSI HY
PARKER BB2HLUS18A SERIES 2H 4.125 IN 1.50 IN 3000PSI H
BIMBA H-0912-DZ SERIES 500 DOUBLE ACTING 12X1-1/16IN HY
NEW ENERPAC STRD121 D/A SWING 2600PSI HYDRAULIC CYLINDE
TRC HYDRAULICS 17258 3 IN DOUBLE ACTING HYDRAULIC CYLIN
PARKER LINEAR ACTUATING DOUBLE ACTING 8 IN 51 IN HYDRAU
TRC HYDRAULICS 182455 4 IN DOUBLE ACTING HYDRAULIC CYLI
1417278 15IN TUBE DOUBLE ACTING 4 IN HYDRAULIC CYLINDER
PARKER 04.00 CSB2HLUS19AC 19.000 SERIES 2H 19 IN 4 IN 3
NEW PARKER HH168984 DOUBLE ACTING 2 IN HYDRAULIC CYLIND
NEW SCHRADER BELLOWS PLC112131 6.000 6IN 1400PSI HYDRAU
NEW ENERPAC SULD-201V 4200LBS 20KN VITON SW CL UF D/A H
HYDRO-LINE SPOTTON 4X 6 IN 4 IN DOUBLE ACTING HYDRAULIC
METSO? NTS6HN-63/40 DOUBLE ACTING HYDRAULIC CYLINDER B2
TRIANGLE 31010-53 S-3509 1 IN 1-1/8IN DOUBLE ACTING HYD
PARKER CBB2HKT14A DOUBLE ACTING 16 IN 2 IN 3000PSI HYDR
NEW ATLAS A064053 DUAL SHAFT 2-1/2 IN DOUBLE ACTING HYD
MILLER FLUID POWER A86B2N 11-5/16 IN 4 IN 500PSI PNEUMA
NEW ENERPAC STLS121 SWING SINGLE ACTING 1.12IN STROKE H
PARKER DD2H DOUBLE ACTING 25-3/4 IN 3-1/4 IN 3000PSI HY
NEW SPX 100153 HYTEC THREADED BODY CYL 3/4-10 UNC HYDRA
COLUMBIA MACHINE 366.2.405 11-5/16IN STROKE 1-1/2IN HYD
PARKER CD2HLT19AC 3 IN 2-1/2 IN 3000PSI DOUBLE ACTING H
PARKER JB2HXKTS03 DOUBLE ACTING 15 IN 4 IN 2000PSI HYDR
SHEFFER 1-1/2MHFB30CCK 30IN STROKE 1-1/2IN BORE HYDRAUL
PARKER 04.00 SB2HCTS13A 7.000 DOUBLE ACTING 7 IN 4 IN H