PLC的監(jiān)視定時器缺省值為200ms（可用D8000來設定），正常情況下PLC掃描周期小于此定時時間。如果由于有外界干擾或程序本身的原因使掃描周期大于監(jiān)視定時器的設定值，使PLC的CPU出錯燈亮并停止工作，可通過在適當位置加WDT指令復位監(jiān)視定時器，以使程序能繼續(xù)執(zhí)行到END。
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CROUSE-HINDS5000111-8 


HONEYWELLMICROSWITCH922H26Q-C9P-LPROXIMITYSWITCH9.6/55VDC，200MA，LSZ4001


HUBBELL1201-GA.C.TOGGLESWITCHES15AMP，120/277V


VICKERS0885385REEDSWITCH


LUMBERGRSRK50-614/20F 


NIBWESTINGHOUSEOT2D4 


CROUSE-HINDS5000135-95 


FESTOSME-8-S-LED-24 


HONEYWELLMICROSWITCHMPSD11PHOTOELECTRICLIMITSWITCHW/NC2D-JP-DC48V


SQUARED9001-TS3K10 


OMRONE3F-3LZPHOTOELECTRIC 


TEMPCOEHD-108-101 


DWYERINSTRUMENTS1823-20-2-5 


HONEYWELLP/N22017TERMINALBLOCKSMODEL621-9950


AMPHENOLSINESYSTEMSA416-4K00-A6FEMALECONNECTORPLUG16POSITION 


INCLUDES(16)ELAV-260-1616-302PINS


TELEMECANIQUEXB4BW34B5 


HUBBELLAOZ-4ADAPTERA0Z-4，E30816-1ENCL&GASKFIXT


NIBALLENBRADLEY800T-Q10A 


NIBENTRELEC49302705PILOTLIGHT999297127VAC-DC


ELECTRONBEAMTECHNOLOGIESQCC-144 


GRAPHICCONTROLS10-55PRESSURE 


ALLENBRADLEY1492-J3 


ADVANCEAUTOMATIONCOMPANYLS-10R-NOLMIT 


TPC97346RETRACTILEQUICK-CONNECTCABLE16/4MALE/FEMALE 


MERCOIDCONTROLAP-89-37 


STA-KONRC10-250FFEMALEDISCONNECTSFOR0.25X0.032 


KEYEDINTERLOCKSWITCHAZ1612ZIB1，230V，4A


AMPHENOL97-18-29P 


ALLENBRADLEY1492-W4SER.A 


ALLENBRADLEY800T-PB16PUSHBUTTONSERT，40171-002-01W/800T-XASERD


ZANDERAACHENKL14SWITCH16A250VT85VDE0660


ALLENBRADLEY800T-H4812LOCKCYLINDERSWITCHWITHAB800T-XD1 


OMRONXW2Z-200A2MCABLEFORSCREW 


NIBTREX-ONICS63440/97035 


THOMAS&BETTSZA-100-3/8STEEL 


IFMEFECTORL31076CONNECTORCABLESTRAIGHTMINI/5-AC-X/X-S0L-PVC-30FT


HULL864732KIT，LYOPHILIZER


TELEMECANIQUEXB4BD33 


TELEMECANIQUEXB4BW35B5


NIBBRIDGEPORT435-SLTIUS 


TELEMECANIQUEZB2BW64PUSHBUTTONMUSHROOM2POSITION 


SQUARED9001-KM-1PILOTLIGHTMODULES9001KM1SER.G，110-120V


NIBCUTLER-HAMMER10250T9 


SCOTCHLOKMNU14-187DMIX 


ALLENBRADLEY800TP-16PILOTLIGHTW/X-210963TRANSFORMER120V 


NIBCUTLER-HAMMER3TA400KTERMINALASSY.4212B61G023/0-250MCM 


NIBCMCAN-130A175AGRAYCONNECTORS6325-G197-056-4380


NIBLUMBERGASBSV45DISTRIBUTIONBOXASBSV-4-5，MAT.NR:11133






























FEDEGARIGM100124CLAMPSSB12690


CUTLERHAMMER10250TB63 


NIBNSISC-4/0COPPERCOMPRESSION 


SQUARED9007-AW16LIMITSWITCHSER.C，W348-SI6-G2


NIBSIEMENS3SB1001-0AE32 


SQUARED9007-B52D，120VAC1/4HP10AMPSER.B


SQUARED9007-C054 SER.A 


COENMAXON3510-093-33 


HONEYWELLLSZ-1EPLUNGER 


SQUARED9013HRG2-S6 


ALLENBRADLEY800T-J44KC1 


PIZZATONFB220BB-DN2 


SQUARED9007-31032-452-51 


NIBSTIHP2008-02SMLIMITSWITCH2N/C，M16，75mmSHAFT+ADAPTER


SQUAREDCLASS9007TYPEBO62A2 


FESTO18685DUOCABLEKM12-DUO-M8-GDGD


THOMAS&BETTS54610 


NIBDWYER1823-2SERIES1800DIFFERENTIAL 


NIBALLENBRADLEY800MR-Q24RSSERD 


RTECORP2609459A05BTERMINALCONNECTORSDC843186，1/0STR，2/0SOL


NIBGENERALELECTRICEB27A04STERMINALBOARDWIRESIZE4W/183B4226P-IBLOCK


NIBHONEYWELLMICROSWITCHBZE6-2RQ 


YALEHOIST41-KNIT 


PIZZATOFR-573STABLEPOSITION 


NIBGENERALELECTRICP9MPLBSDN12NCDI 


AMPHENOLMS3108A14S-2P 


HONEYWELLMICROSWITCHPTSHA201SELECTORSWITCHW/PTSZ74KNOB


TURCKB5131-0FIELDWIREABLEPLUGSANDRECEPTACLES6904910U6500


NSI250TCONNECTORS 


BW2B-LINEFASTENERS，RODANDWIREFASTENERS，100COUNTEACH


EPICCONNECTORS10.0050BASE 


PEPPERLFUCHSNBB5-18GM80-WS 


THOMAS&BETTSSTA-KONRC10-10FFORKTERMINALS12-10AWGCU 


CONTROLSGPRA-SB14U2 


CUTLERHAMMER10250TA17 


SQUARED9001-KM38LGSER.HGREENPULL-PUSHBUTTONSWITCH，W/LAMPBSD-1318-006


ALLENBRADLEY800T-FXTD4 


LUMBERGASBS-2-M12-4SPLITTER1MALE-4PIN2FEMALE-4PIN


OSBORN24130LOCKOUTHASPS


MURRELEKTRONIK13881COUPLERSTMALE/FEMALE5PIN07419


ALLENBRADLEY800T-PSD16 


NIBQVSCA260-2DATASWITCHDB25F 


NIBANDERSONPOWERPRODUCTSA32470-1009EBCA 


NIBIDECHW1P-1FQD-G-24V 


ALLENBRADLEY800T-APUSHBUTTONS800TA，SER.T，800T-XD1SER.D800T-XAA