Foxboro P0916NG
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PLC自检信号很多,内部器件也很多,多数使用者未充分发挥其作用。
其实,*可利用它进行PLC自身工作的监控,或对控制对象进行监控。
这里介绍一种用PLC定时器作看门狗,对控制对象工作情况进行监控的思路。
如用PLC控制某运动部件动作,看施加控制后动作进行了没有,可用看门狗办法实现监控。具体作法是在施加控制的同时,令看门狗定时器计时。如在规定的时间内动作完成,即定时器未超过警戒值的情况下,已收到动作完成信号,则说明控制对象工作正常,无需报警。
若超时,说明不正常,可作相应处理。
如果控制对象的各重要控制环节,都用这样一些看门狗"看"着,那系统的工作将了如指掌,出现了问题,卡在什么环节上也很好查找。
还有其它一些监控工作可做。对一个复杂的控制系统,特别是自动控制系统,监控以至进一步能自诊断是非常必要的。它可减少系统的故障,出了故障也好查找,可提高累计平均*运行时间,降低故障修复时间,提高系统的可靠性。
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厦门莫格电气自动化有限公司
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OMRON 24V RELAY TIMER H3YN-4
OMRON TIMER RELAY H3CR-F8 300
SIEMENS 20A 600V RELAY 3TF4022-0A
IDEC RELAY SOCKET BASE LOT OF 2 SH4B-05
HOURS INDICATOR NUMERICAL COUNTER 621-07-3 102951
ALLEN BRADLEY 7AMP 24VDC RELAY LOT OF 10 700-HC14Z24-4 SER D
ABB 4P RELAY TBC25
OMRON 24VDC RELAY W/ BASE LOT OF 3 G3RZ-201SLN 101289
ALLEN BRADLEY 3A 12VDC COIL GENERAL PURPOSE RELAY 700-HC14Z12 SER. C *NEW*
DAYTON RELAY SOCKET BASE LOT OF 2 5X852E
OMRON 24VDC RELAY LOT OF 6 G2R-2-SND
ALLEN BRADLEY 10A 120VAC RELAY SER.D 700-HA32A1 102402
SQUARE D 24VDC RELAY LOT OF 5 8501KUD13M1P14V?53
ALLEN BRADLEY 12V 10A RELAY LOT OF 2 700-HA32A 12
ALLEN BRADLEY 24VDC 10A RELAY SER D LOT OF 2 700-HA32Z24 100733
IDEC RELAY LOT OF 4 RR3B-UL
SIEMENS RELAY 3TB40 17-OA
POTTER & BRUMFIELD 24VDC RELAY LOT OF 3 KU-6015-1
ALLEN BRADLEY 10A 300V RELAY SOCKET BASE LOT OF 6 700-HN116 SER B
BANNER SWITCH PROGRAMMING MODULE CL5RA
FUJI ELECTRIC 200--220V 8A RELAY LOT OF 3 HH62P-CRL
PILZ 24VAC/DC 5,0VA 2,5W SAFETY RELAY PNOZ X3P24VDC24VAC3N?/O1N/C1SO 99258
IDEC RELAY LOT OF 4 21115-A3
DAITO 1.3A FUSE LOT OF 6 P413
ALLEN BRADLEY 120VAC RELAY SER.C 700-HA32A1-1
OMRON RELAY WITH BASE LOT OF 3 G2R-2-SN 101308
MARS CONTROL CO. RELAY T1L-60-61
SIEMENS CONTROL RELAY LOT OF 2 8 TH 80 22-0A
OMRON RELAY SOCKET BASE LOT OF 4 PYF08M
ALLEN BRADLEY RELAY LOT OF 5 700-HA32A1 SER C
SICK SAFETY RELAY UE10-3OS3D0 / 6024918 99532
IDEC DC24V RELAY LOT OF 4 RH2B-UL
OMRON 24VAC RELAY LOT OF 3 LY2 99814
SQUARE D 120V RELAY LOT OF 5 8501 KP12V20 SER D
OMRON 14 PIN RELAY SOCKET LOT OF 5 PYF14T
ALLEN BRADLEY 24V 7A RELAY LOT OF 6 700-HC24Z24 SER D
DURAKOOL MERCURY RELAY 120V 60HZ BF3-7024 NO
IDEC DC 24 V RELAY LOT OF 2 RY2S-U 99804
OMRON RELAY WITH BASE LOT OF 2 MK2P-S
CUTLER HAMMER DPDT 110VDC COIL RELAY SER.A2 NIB D5PR2A1 102625
IDEC 24VDC RELAY LOT OF 3 RH4B-UL
OMRON 24VDC MINI PURPOSE RELAY WITH BASE MY4ZN
EMECANIQUE CONTROL RELAY LP1D09
NCC CONTROLS SOLID STATE TIMER T1K-5-461
AGASTAT 1-10 MIN TIME DELAY RELAY NNB 7022VF 104571
ALLEN BRADLEY 110/120V 10A RELAY 700-F400A1 SER. B *LOT OF 5*