PLC工作過(guò)程的特點(diǎn) ：：
(1)PLC采用集中采樣、集中輸出的工作方式，這種方式減少了外界干擾的影響。
(2)PLC的工作過(guò)程是循環(huán)掃描的過(guò)程，循環(huán)掃描時(shí)間的長(zhǎng)短取決于指令執(zhí)行速度、用戶(hù)程序的長(zhǎng)度等因素。
(3)輸出對(duì)輸入的影響有滯后現(xiàn)象。PLC采用集中采樣、集中輸出的工作方式，當(dāng)采樣階段結(jié)束后，輸入狀態(tài)的變化將要等到下一個(gè)采樣周期才能被接收，因此這個(gè)滯后時(shí)間的長(zhǎng)短又主要取決于循環(huán)周期的長(zhǎng)短。此外，影響滯后時(shí)間的因素還有輸入濾波時(shí)間、輸出電路的滯后時(shí)間等。
(4)輸出映像寄存器的內(nèi)容取決于用戶(hù)程序掃描執(zhí)行的結(jié)果。
(5)輸出鎖存器的內(nèi)容由上一次輸出刷新期間輸出映像寄存器中的數(shù)據(jù)決定。
(6)PLC當(dāng)前實(shí)際的輸出狀態(tài)由輸出鎖存器的內(nèi)容決定。
STMICROELECTRONICS Integrated Circuit, M27C512-20FI, LOT OF 13, SHIPSAMEDAY
STMicroelectronics IC REG LINEAR POS ADJ 3A, LD1085CDT-R, Lot Of 49, SHIPSAMEDAY
STMicroelectronics IC INVERTER 6CH 6-INP, 74AC04MTR, LOT OF 219, SHIPSAMEDAY
STMicroelectronics IC EPROM 512K PARALLEL, M27C512-12B1, LOT OF 26, SHIPSAMEDAY
STMicroelectronics IC EPROM 512K PARALLEL 28CDIP, M27C512-15F1, LOT OF 19
STMicroelectronics IC BUFFER NON-INVERT, 74AC244M-TR, LOT OF 350, SHIPSAMEDAY
STMicroelectronics FILTER RC ESD SMD, ST1284-01A8, LOT OF 15, SHIPSAMEDAY
STI T5009, T5009-021SM, Non-Locking Interlock Switch, SHIPSAMEDAY#1606E2
Stec SEF-1N, Gas N2, 50 SLM, 1/4" Comp, SEF1N, Shipsameday#1605H6
STARRETT Indicator, 196B1, EDP50699, SHIPSAMEDAY#1638P2
STARRETT Dial Indicator,0 to 0.250 In,0-100, 81-241J, 81241J, SHIPSAMEDAY#1615AT
STARRETT 196B1, EDP50699, Indicator, NO TIP, What U See / What U Get #1638P3
ST 25P64V6G, 78245, Lot Of 35, Shipsameday, D#51
SSI SENSOR DIGITAL GAUGE 200PSI LCD, MG1-200-9V-R, Lot Of 2, SHIPSAMEDAY#1181B
SSAC Voltage Monitor Three Phase, WVM911AN, 400-480VAC, Shipsameday #1473A7
Square D, Pneumatic Timing Relay, 9050A010D, 9050A010D0410, Shipsameday, #1220D
Square D, FS222R, 60A, 240V, 1Ph, 2 Wire, Shipsameday, Free Shipping #1641AR
Square D, 8910DPA62V04, 80367226, Shipsameday #1641AK
Square D TIMER 9050JCK1F2V20, 9050-JCK1F2V20, ShipSameDay BOX "B" #1614B30
SQUARE D Thermal Magnetic Circuit Breaker 80A, 1P, QOU180, SHIPSAMEDAY#1171BG
Square D SDT115GFI, 15A, 1 Pole, Shipsameday W/2-3dayship #1371W
SQUARE D Pilot Light, P9001-JT1, 9001JT1, Lot Of 4, ShipSameDay BOX "B"#1614B44
Square D Motor Starter, 8736-SC08, 31041-400-42, ShipSameDa RACK K #K85
Square D Motor Control Starter Coil 31041-400-42, 3104140042 Shipsameday #1616AB
Square D Molded Case Circuit Breakers, 200A, 2 POLE, 120/240V, SDT2200, #150ZF
SQUARE D Miniature Circuit Breaker, 15A, 2P, 240V, QOU215H, SHIPSAMEDAY#1171BK
Square D Merlin Gerin 24535, D4A Multi9 C60 Shipsameday #1559A2 BOX 2
Square D INTERLOCK DISCONNECT 9999-R-7, 9999-R7, 9999R7, Shipsameday #1641AC
Square D FA24040AB I-Line Circuit Breaker 40 Amp, 2 Pole SHIPSAMEDAY#1545A
Square D Control Relay, 8501-G080, 8501G080, NNB, 120 Coil, Shipsameday #1543AX
SQUARE D CIRCUIT BREAKER, 3 POLE, 15 AMP, FAL34015, SHIPSAMEDAY
Square D Circuit Breaker FHL3600311M1212, 4014001, 3AMP, 3 Pole, shipsame #1644V
Square D Circuit Breaker 225 AMP, KH36225, SHIPSAMEDAY RACK M #4
SQUARE D 9999SA3 PUSHBUTTON START STOP SWITCH KIT 9999 sa3 red black push #1546Y
Square D 9999-R-6, 9999-R6, 9999R6, Shipsameday #1641AD
Square D 9998-LB-13, 9998LB13, Contact Replacement Kit, Shipsameday#1555VA
Square D 9001KXSYC5 Selector Switch Operator 30mm Type KX, SHIPSAMEDAY #1545R
Square D 8994-SYS80 Rack Mount Weld Control Module, RMWC3844, 3844-002, #1211H
Square D 60198, D30A, Merlin Gerin Multi C60, 240V, Shipsameday #1472AN
Spray Systems QUA-SS (65/50) & QJJA-SS, 3/8" npt, Lot Of 11,Ship Same Day #1648H
SPRAY NOZZLE 3/8HHSJ-PVC-17082 (LOT OF 9) #121N
SPRAY NOZZLE 1/8 NPT,PVC (LOT OF 14) HARRINGTON WL1/280, BETE FOG SERIES #120A4
Sprague Goodman GKY30066, Lot Of 693, Shipsameday, D#32
Sprague Goodman GKY30066, Lot Of 1000, Shipsameday, D#41
Spirax Sarco StrainerConnection 1/2", 67980, SHIPSAMEDAY #1215B2
Spirax Sarco Steam Trap MST21, 1/2", CF16F, 1.4305, SHIPSAMEDAY#1215A4
SPI/Amtos parallel set 1/2" (5x), 5/8" (1X), 3/4" (1X), Shipsameday #1325A12
Spectra Strip Amphenol Flat Cable 132-2801-026, 1322801026, Shipsameday #1472B
Spears Union 1/4", Socket X Socket, P/N 857-002, 857002, Lot Of 9 #101Y
SPEARS Tee 1.50", TxT, 805-015, 805015, Lot Of 9 Shipsameday W/2-3daysship #114J
Spears Reducer Coupling SxS 1-1/2" X 1", 829-211, 829211, Lot Of 10 #101W
Spears Reducer Coupling SxS 1-1/2" X 1", 829-211, 829211, Lot Of 10 #101W
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