PLC工作過程的特點(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的工作過程是循環(huán)掃描的過程,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。
Swagelok actuator for BK series valve 1/4" , 4BK, LOT OF 7, SHIPSAMEDAY
SWAGELOK 6LV-8-WVCR-6-DF-4, Reducer VCR 1/2" FVCR x 1/4" FVCR, SHIPSAMEDAY#Q24
SWAGELOK 6LV-4-WVCR-9-DF, Female Elbow 1/4" FVCR, LOT OF 2, SHIPSAMEDAY#S8A
SWAGELOK 3-Way Ball Valve 3/8", SS-44XTS6, SHIPSAMEDAY#1220P1
Swagelok 3-Way Ball Valve 3/8", SS-43GXS6, SS43GXS6, SHIPSAMEDAY #1373E4
SWAGELOK 3-Way Ball Valve 1/4", SS-42GXS4, SS42GXS4, SHIPSAMEDAY#1325F2
SWAGELOK 3-Way Ball Valve 1/4" FNPT, SS-44XF4, SHIPSAMEDAY#131Q7
SWAGELOK 3-Way Ball Valve 1/4" FNPT, SS-43GXF4-1466, SHIPSAMEDAY #M13
SWAGELOK 3-Way Ball Valve 1/4" FNPT, SS-43GXF4-1466, SHIPSAMEDAY
SWAGELOK 3-Way Ball Valve 1/2", SS-45XS8, SHIPSAMEDAY
Swagelok 316L-4-VCO-1A, 316L-4-VCO-3A, SS-4-VCO-3-4MTW, SS-4-VCO-3-4TA #128R28
Swagelok 3 Way Valve 1/4" Fnpt X 1/4" Tube, MA2610001, W092137, Shipsameday AA#3
Swagelok 3 WAY BALL VALVE 1/8" FNPT, SS-42XF2, SS42XF2, SHIPSAMEDAY #1174P5
Swagelok 3 WAY BALL VALVE 1/8", SS-41GXS2, SS41GXS2, LOT OF 2 SHIPSAMEDAY#1171N3
Swagelok 3 WAY BALL VALVE 1/4" FNPT, SS-43FX4, Shipsameday #L18
Swagelok 1/2" VCR Poppet Check Valve 1 Psi, SS-CHVCR8-1, Shipsameday #1471P6
Susumu Res .47 Ohm 1/2W 1%, RL1632-R470-F, RL16R.47FCT-ND, Lot Of 1000, E#110
Superlok Ball Valve 1", SBV210-S-16, SBV210S16 1000psi 316 SCD, Shipsamday, Z#11
SUPER DOOR KING HET 8055-080, MicroPLUS Receiver, SHIPSAMEDAY #1212V1
SUNX SS-D20, SSD20, Photoelectric Sensor, SHIPSAMEDAY#108P11
Sunx S-LINK Terminal SLTBP8TY, SL-TBP8-TY, SL-TBP8, Shipsameday#1220C
Sunx S-LINK Terminal SLTBP8TY, SL-TBP8-TY, SL-TBP8, missing top label #1220K
Sunx S-LINK Terminal SLTB16, SL-TB16, Shipsameday #1220M
Sunx S-LINK Gateway Controller SLGU1C, SL-GU1-1, N8Q07, Shipsameday #1220L
SUNX SH-21E, SH21E, Photoelectric Sensor, BOX OF 3, SHIPSAMEDAY#108P17
SUNX SH-21E, SH21E, Photoelectric Sensor, BOX OF 2, SHIPSAMEDAY#108P15
SUNX SH-21E, Photoelectric Sensor, BOX OF 2, Only 2 Screws, SHIPSAMEDAY#108P20
SUNX SH-21, SH21, Photoelectric Sensor, BOX OF 2, SHIPSAMEDAY#108P13
SUNX Proximity Sensor, GS-5S, GS-5S513K, GS-5S-513K, SHIPSAMEDAY
SUNX Photoelectric Sensor SS2-300F, SS2300F, BOX OF 2, SHIPSAMEDAY#108P10
SUNX Photoelectric Sensor EX-13P (2X) & EX-13AD (2X) Box Of 4, SHIPSAMEDAY#108P9
SUNX Photoelectric Sensor EX-13P (2X) & EX-13AD (2X) Box Of 4, SHIPSAMEDAY#108P7
SUNX Photoelectric Sensor EX-13EP, EX13EP, Box Of 2, SHIPSAMEDAY#108P8
SUNX PHOTOELECTRIC Beam Sensor A7N, EX2-M5EP, EX2M5EP #1646B17
Sunx NPS-C7W, NPSC7W, ShipSameDay W/2-3 DaysShip#1173R
SUNX EX-13P, EX13P, Photoelectric Sensor, BOX OF 2, SHIPSAMEDAY#108P14
SUNX EX-11P, EX11P, Photoelectric Sensor, BOX OF 4, SHIPSAMEDAY#108P12
SUNX EX-11EP, EX11EP, , Photoelectric Sensor, BOX OF 3, SHIPSAMEDAY#108P16
SUNX EQ-22, EQ22, Photoelectric Sensor Switch, SHIPSAMEDAY#129V13
SUNX EQ-22, EQ22, Photoelectric Sensor Switch, Box Of 2, SHIPSAMEDAY#108P6
SUNX DP2-42N, Display Digital Pressure Sensor DP242N, UDP242N SHIPSAMEDAY#129V11
SUNX DP2-41E, DP241E, LED DISPLAY DIGITAL PRESSURE 100kPa, UDP241E, SHIPSAMEDAY
SUNX DP2-41E, Display Digital Pressure Sensor DP241E, UDP241N SHIPSAMEDAY#129V12
SUNX Amplifier Photoelectric, FX4L-A3R, FX4LA3R, Lot Of 2, SHIPSAMEDAY#108P3
SUNX Amplifier Photoelectric, EX2-M5ED & EX2-M5EP, BOX OF 2, SHIPSAMEDAY#108P4
SUNX Amplifier Photoelectric Sensor, SS-A5, SSA5, Lot Of 2, SHIPSAMEDAY#108P2
Sunny Elec Tuning Fork 32.768khz PTH Cyl 20 Ppm, TF210-00401, Lot Of 1065, F#48
Sun Electric HEATER TEMPERATURE CONTROL, AEO-000-162-S2,
Summer's Lease By John Mortrimer, Franklin Library, Hardcover
STMicroelectronics Operational Amplifiers, TS912BIDT, LOT OF 89
STMicroelectronics Inverters Hex Inverter, 74AC04M, LOT OF 38, SHIPSAMEWDAY