1788 Redundant FF 4 Way Junction Box
1788-FBJB4R
1788-FBJB4R
程序不仅要正确,还要可靠。可靠反映着PLC程序的稳定性,这也是对PLC程序的基本要求。
有的PLC程序,在正常的工作条件下或合法操作时能正确工作,而出现非正常工作条件(如临时停电,又很快再通电)或进行非法操作(如一些按钮不按顺序按,或同时按若干按钮)后,程序就不能正常工作了。这种程序,就不大可靠,或说不稳定,就是不好的程序。
好的PLC程序对非正常工作条件出现,能予以识别,并能使其与正常条件衔接,可使程序适应于多种情况。好的PLC程序对非法操作能予以拒绝,且不留下“痕迹”。只接受合法操作。
联锁是拒绝非法操作常用的手段,继电电路常用这个方法,PLC也可继承这个方法。
备货,备货,降降降,火火火,火火火……
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RED LION CONTROLS APLRI630 NSFP APLRI630
RED LION CONTROLS T4820205 NSFP T4820205
RED LION CONTROLS IMT02060 USPP IMT02060
NEW RED LION CONTROLS GEM10001 PRESET COUNTER 2 INPUT
RED LION CONTROLS SERIES 600 5162040 METER 51620400789
Red Lion Controls Model LGD 1GD00100
RED LION CONTROLS IMP23163 DIGITAL METER GUAGE READOUT
RED LION CONTROLS IMP20162 DIGITAL METER CONTROLLER
RED LION CONTROLS 4410-500 NSFP 4410500
RED LION CONTROLS 4411000 NSFP 4411000
RED LION CONTROLS CSMSTRSE NSFP CSMSTRSE
RED LION CONTROLS PAX S 0000
RED LION CONTROLS MCI1R01A USPP MCI1R01A
RED LION CONTROLS APLSP6A0 NSFP APLSP6A0
RED LION CONTROLS APLSP6B0 NSFP APLSP6B0
RED LION CONTROLS APLTC404 THERMOCOUPLE INDICATOR NIB
RED LION CONTROLS 4700600 USPP 4700600
RED LION CONTROLS 4701200 USPP 4701200
RED LION CONTROLS PAXDP000 USPP PAXDP000
RED LION CONTROLS LGD00000 USPP LGD00000
RED LION CONTROLS APLPT500 USPP APLPT500
RED LION CONTROLS APLPT400 USPP APLPT400
RED LION CONTROLS IMI04133 USPP IMI04133
RED LION CONTROLS IMP23103 NSFP IMP23103
RED LION CONTROLS 621 USPP 621
RED LION CONTROLS IMD20000 USPP IMD20000
RED LION CONTROLS LGD00101 USPP LGD00101
Red Lion Controls DLC-01001 Dual Loop Controller *LNC*
RED LION CONTROLS PAXI0000 16042 NEW IN BAG
RED LION CONTROLS LGD00001 NEW IN BOX /SEALED BAG
RED LION CONTROLS CSPID2S0 USPP CSPID2S0
RED LION CONTROLS PCU00002 NSFP PCU00002
RED LION CONTROLS PBA04101 NSFP PBA04101
RED LION CONTROLS IMR02100 NSFP IMR02100
RED LION CONTROLS 61040 USPP 61040
Red Lion Controls APLCL 400 Apollo Current-Loop Ind.
RED LION CONTROLS PCU01000 USPP PCU01000
RED LION CONTROLS PCU10001 USPP PCU10001
3981 NEW Red Lion Controls APLPT5 Time Indicator
RED LION CONTROLS PCU10000 NSFP PCU10000
RED LION CONTROLS TCU10000 NSFP TCU10000
RED LION CONTROLS IMI04130 NSFP IMI04130
RED LION CONTROLS APLCL401 NSFP APLCL401