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在不同的工业控制系统中,工控软件虽然完成的功能不同,但就其结构来说,一般具有如下特点:实时性:工业控制系统中有些事件的发生具有随机性,要求工控软件能够及时地处理随机事件。周期性:工控软件在完成系统的初始化工作后,随之进入主程序循环。在执行主程序过程中,如有中断申请,则在执行完相应的中断服务程序后,继续主程序循环。相关性:工控软件由多个任务模块组成,各模块配合工作,相互关联,相互依存。人为性:工控软件允许操作人员干预系统的运行,调整系统的工作参数。在理想情况下,工控软件可以正常执行。但在工业现场环境的干扰下,工控软件的周期性、相关性及实时性受到破坏,程序无法正常执行,导致工业控制系统的失控,其表现是:程序计数器PC值发生变化,破坏了程序的正常运行。PC值被干扰后的数据是随机的,因此引起程序执行混乱,在PC值的错误引导下,程序执行一系列毫无意义的指令,最后常常进入一个毫无意义的“死循环”中,使系统失去控制。
输入/输出接口状态受到干扰,破坏了工控软件的相关性和周期性,造成系统资源被某个任务模块独占,使系统发生“死锁”。数据采集误差加大。干扰侵入系统的前向通道,叠加在信号上,导致数据采集误差加大。特别是当前向通道的传感器接口是小电压信号输入时,此现象更加严重。RAM数据区受到干扰发生变化。根据干扰窜入渠道、受干扰数据性质的不同,系统受损坏的状况不同,有的造成数值误差,有的使控制失灵,有的改变程序状态,有的改变某些部件(如定时器/计数器、串行口等)的工作状态等。笔者在研制电力远程抄表系统时就曾遇到因现场强电磁干扰而造成RAM数据经常性被破坏的情况。控制状态失灵。在工业控制系统中,控制状态的输出常常是依据某些条件状态的输入和条件状态的逻辑处理结果而定。在这些环节中,由于干扰的侵入,会造成条件状态错误,致使输出控制误差加大,甚至控制失常。
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厦门仲鑫达自动化设备有限公司
欧阳英(销售经理)
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XPSMC16Z Modicon Telemecanique Safety Controller 24VDC 16 Input?XPS-MC
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Telemecanique Schneider Electric XPS-MC safety controller
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TELEMECANIQUE XPS-AT5110 SAFETY RELAY
Telemecanique XPS-VN1142 Safety Relay XPSVN1142 New No Box
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USED Telemecanique XPS-AR Safety Relay XPSAR311144P
TELEMECANIQUE *NEW* XPSAK311144P XPS-AK SAFETY RELAY
Telemecanique XPS-AK311144P Safety Relay XPSAK311144P XPS-AK Used
TELEMECANIQUE XPS-AK311144 NSFP XPSAK311144
TELEMECANIQUE XPS-ECP5131 NSFP XPSECP5131
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Telemecanique 115VAC 50/60Hz 24VDC XPS-AR
TELEMECANIQUE XPS-AP5140 SAFETY RELAY
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Telemecanique XPS-AR Safety Relay XPSAR311144P
TELEMECANIQUE XPS-ECP5131 USPP XPSECP5131
Telemecanique Not-Aus Relais XPS AL 5110 NEU OVP
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USED Telemecanique XPS-AR Safety Relay XPSAR311144
TLEMECANIQUE XPS-AK311144 SAFETY RELAY 300V 5AMP
Telemecanique Preventa Type XPS-MP Ref: XPSMP11123
TELEMECANIQUE SAFETY RELAY XPS-AV XPSAV11113
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TELEMECANIQUE XPS-AMF5142 NSFP XPSAMF5142
USED TELEMECANIQUE SAFETY RELAY XPS-AK DB
TELEMECANIQUE PREVENTA SAFETY RELAY FOR E-STOP / LIGHT CURTAIN XPS-AR
Telemecanique Preventa XPS-AM XPSAM5140
TELEMECANIQUE XPS-AK311144P USPP XPSAK311144P
TELEMECANIQUE XPS-AMF3442 USPP XPSAMF3442
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TELEMECANIQUE XPS-AR3351144 USPP XPSAR3351144
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Telemecanique XPS-AR XPSAR311144P 24V Safety Relay
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TELEMECANIQUE TYPE XPS-VN XPSVN3442
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Telemecanique Monitoring Device for Emergency Stop #XPS
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Telemecanique XPSAC5121 XPS-AC 027401 -Neu/OVP-
Telemecanique XPS-AP XPSAP5140 XPSAP 5140
TELEMECANIQUE XPS-AK XPSAK351144P QUANTITY! SAFETY RELAY 120VAC
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TELEMECANIQUE XPS-AF5130 NSFP XPSAF5130
Telemecanique Magnetschalter Modul XPSDMB1132 24V/DC,Relais OVP XPS DMB 1132
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TELEMECANIQUE XPS - ASF Ref: XPSASF5142
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TELEMECANIQUE SAFETY RELAY XPS-ASF3442 , USED
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XPS-AM TELEMECANIQUE ID333
Newly ListedTelemecanique XPS Safety Relay XPSAS5140
TELEMECANIQUE PREVENTA SAFETY RELAY TYPE XPS-AR REF XPSAR311144
TELEMECANIQUE XPS-AL/SERIEB SAFETY RELAY, 115 VAC, 50/60 HZ, XPSAL3410
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TELEMECANIQUE XPSAP5140 TELEMECANIQUE XPS-AP XPSAP5140 24V AC +10%/-20% DC +/-20
Telemecanique XPS-DMB 24V DC XPSDMB1132P Emergency Stop Safety Relay
Telemecanique XPSAC5121 XPS-AC 027401 -used-
Telemecanique Not-Aus Relais XPS AL 5110" PREVENTA"
Telemecanique Safety Relay XPS-AP XPSAP5140
TELEMECANIQUE XPS-AL XPSAL3410 SAFETY RELAY
LOT2 TELEMECANIQUE XPS-ECP 24V-AC XPSECP5131 CONTACT RELAY OUTPUT MODULE B245829
TELEMECANIQUE 24V SAFETY RELAY XPS-BA
Telemecanique Preventa XPS-AS 3440
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Telemecanique XPS-AM
Telemecanique XPSJ08311 Photoelectric Sensor XPS-J 08311 48Vdc 0.2Amps New
Telemecanique XPS-BC
Telemecanique XPS-AL XPSAL5110 Preventa Safety Relay 24V AC/DC
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Telemecanique XPS-AP XPSAP5140 24VAC
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TELEMECANIQUE XPS-AM 24V
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Telemecanique XPS-AS 24V AC/DC Safety Relay
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TELEMECANIQUE XPS-AT PREVENTA EMERGENCY-STOP SAFETY CONTROL RELAY
SAV Spanntechnik EP 250 , Elektro Magnetspannplat?te 400...
Sick M 4000, Sick M40S + Sick M40E, Sender + Empf?nger ...
Siemens 1FT 5076-0AC01-Z , Servomotor mit Haltebremse
Marposs 6840025609, Board für Marposs E9066
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Transformator Otto Schmidt D35, 35 KVA, 3 Phasen
kontrolleuchte Grün,Gelb,Rot 220 Volt / 110 Volt
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Elesta, Climesta 29B
Beckhoff M1410-000
Nord SK CU1-STD, Nord part. no.: 278200020
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KME 29LW14AX71UN , Kent ME13QJ, UK, Monitor Top !!
Siemens 6FM1496-4CA11
Klein SM5/1, Vibrationsmotor?, Rüttler, 380 Volt, 1 KW, ...
Weiss TC 320T Rundschalttisch 320 mm Durchmesser Top, T...
UNIPO 2MM112XKN02, Unipo Monitor
Linearführung , Hubspindel 200 mm, Bohrplatte / Fr?spla...
Yaskawa SGMPH-02A1A-YR3?2, AC Servomotor
NUM 0204200578E1, NUM Sorties Board
Wago 750-402
Almig Air Control 2
Sick PLS 101-112
Santex SUV532 integrator Baugruppe
Perske VS 51.20.4
Patlite EW 24TA, Megaphone ? Sirene ?
Hudelmaier Wendelf?rderer Rundschwingf?rd?erer Rüttler
Kugelrollspinde?l, 16mm Durchmesser, 10mm Steigung , L?n...
Perske VS31.09-2 Motorspindel 0,6 KW, 17350 Umdrehungen...