WOODWARD 9905-387
WOODWARD 9905-387
WOODWARD 9905-387
虽然工业控制机和可编程控制器本身都具有很高的可靠性,但如果输入给PLC的开关量信号出现错误,模拟量信号出现较大偏差,PLC输出口控制的执行机构没有按要求动作,这些都可能使控制过程出错,造成无法挽回的经济损失。
影响现场输入给PLC信号出错的主要原因有:
1)造成传输信号线短路或断路(由于机械拉扯,线路自身老化,特别是鼠害),当传输信号线出故障时,现场信号无法传送给PLC,造成控制出错;
2)机械触点抖动,现场触点虽然只闭合一次,PLC却认为闭合了多次,虽然硬件加了滤波电路,软件增加微分指令,但由于PLC扫描周期太短,仍可能在计数、累加、移位等指令中出错,出现错误控制结果;
3)现场变送器,机械开关自身出故障,如触点接触不良,变送器反映现场非电量偏差较大或不能正常工作等,这些故障同样会使控制系统不能正常工作。
影响执行机构出错的主要原因有:
1)控制负载的接触不能可靠动作,PLC发出了动作指令,但执行机构并没按要求动作;
2)控制变频器起动,由于变频器自身故障,变频器所带电机并没按要求工作;
3)各种电动阀、电磁阀该开的没能打开,该关的没能关到位,由于执行机构没能按PLC的控制要求动作,使系统无法正常工作,降低了系统可靠性。要提高整个控制系统的可靠性,必须提高输入信号的可靠性和执行机构动作的准确性,否则PLC应能及时发现问题,用声光等报警办法提示给操作人员,尽快排除故障,让系统安全、可靠、正确地工作。
3681
PS-M06D12S5-NJ1L(S)
MAGNUM VS 50
FG30-H208G1B
140CPS11420
140CPU67160
A06B-0127-B675#7000-1
IH80
IQDP40
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VMOD-IO
A860-0301-T002 5.5成新
A860-0301-T002 9.5成新
A860-0301-T002 全新
1336-BDB-SP69D
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6DD1681-0AJ1,端子模块SU12
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6DD1681-0GK0,SU13接口模板
6DD1682-0CH2,TDC 机架UR5213
6SE7090-0XX84-0FJ0
AB制动单元,1336-WB110
RGU GDB板,1336-BDB-SP69D
RGU主板,2346FSPM03A
TMC 2F1 120 0.2A P011 P0111
变频器主板,1336FMCBSP1K
电抗器,13213RB250B250A3%
开关模块,3TH4391-0B
去离子罐,3BHL001433P0001
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TT6120
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机笼 P081000000GG 含4个IPM02电源/开关板
ND080B1054
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3503E
442310 2.5*/0.075
4500
140ARI03010
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140CPS11420
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3704E
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8312
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0 608 701 018
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