USAFED-20C22S
扫描周期是PLC的一个重要指标，小型PLC的扫描周期一般为十几毫秒到几十毫秒。PLC的扫描周期长短取决于扫描速度和用户程序的长短。
毫秒级的扫描时间对于一般工业设备通常是允许的，PLC对输入的短暂滞后也是允许的。但对某些I/O快速响应的设备，则应采取相应的处理措施。如选择高速CPU，提高扫描速度；选择快速响应模块、高速计数模块以及不同的中断处理等措施减少滞后时间。
对于用户来说，要提高编程能力，尽可能优化程序；而在编写大型设备的控制程序时，尽量减少程序长度，选择分支或跳步程序等，都可以减少用户程序执行时间。
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Hanyoung Electric AR-20, ship same day #1605AB
Harris Compressed Regulator 25-15, W/ Gauge Shipsameday, Rack D, Bottom #D5
Harris Compressed Regulator 25-15, W/ Gauge Shipsameday, Rack D, Bottom #D5
Harris Compressed Regulator 96-100, W/2 Gauge Shipsameday, Rack D, Bottom #D3
Harting 09150043113 Lot Of 2, ShipSameDay W2/3 Days Shipping#1603A22
HARTING HAN-40D-M-C, Han40dmc, Art. 0921040300104, #117A10
Harting HD Pwer Fe Conn 1663307, 09320006208 (LOT OF 434) CK4.0-ED-6.00BU #125F1
Harting HD Pwer Fe Conn 1663307, 09320006208 (LOT OF 434) CK4.0-ED-6.00BU #125F1
Harvel Plastic 897-010BL, Union 1" SxS, 897010BL, Lot Of 13 Shipsameday #101T
Harvel Plastic 897-010BL, Union 1" SxS, 897010BL, Lot Of 13 Shipsameday #101T
Haydon Linear Actuator X43M4BH-05-001ENG & X43-A0305-NLH-A02, SHIPSAMEDAY#1610A3
Haydon Linear Step Motor, 57H41-3.25-920-0343, 57H41-3.25-920, SHIPSAMEDAY
Haydon Switch E43H42-05-002, step motor, shaft 3/8D X 13L, Shipsameday #120J
Haydon Switch step motor shaft 3/8D X 13L, E43H42-05-003, Shipsameday Rack L #L1
Haydon Switch step motor shaft 3/8D X 13L, E43H42-05-003, Shipsameday Rack L #L2
Haydon Switch Stepper Motor 26841-05-008, 5VDC, 2684101008, SHIPSAMEDAY#1614C8
Haydon Switch Stepper Motor 36440-12, 3644012, 12VDC, 4.6W, Shipsameday #1327Z1
Heater Tape with Percentage Contoller HTWC Ser, HTWC101-010, 1"x10', NNB #1537A7
Hedland Flow Meter HITMP WBF 2GPM, H213A-020-HT, Shipsameday #133Q
Hedland Water Flowmeter, 0.2-2.0 GPM Brass 1/4" FNPT, H205B-020, #1542Z7
Hedland Water Flowmeter, 0.2-2.0 GPM Brass 205B-020, With 3/8" Swagelok #1542Z9
Heidenhain 31013501, 310135-01, Shipsameday W/2-3 Daysshipping #1472R
Heise CM-50393, Bourdon Tube 403 ST.ST Subdivision-I, 0-400 PSI, SS-4H-TSW
Helical Flexible Shatf Coupling MC7C150-20-16, MC7C1502016, Shipsameday #1231A1
Helical Flexible Shatf Coupling MC7C150-20-16, MC7C1502016, Shipsameday #1231A1
Helical Flexible WAC20-6mm-6mm, Ringspann, PO/L1450, shipsameday #1473J
HELICOIL 5401-05, Thread Repair Kit, 7551-05, Shipsameday #140A
HELIUM LEAK GEPRUFT ULTRA-PURITY DP GAS FILTER ASSY 10 Valves 1/4" VCR #1649B
HELIUM LEAK GEPRUFT ULTRA-PURITY DP GAS FILTER ASSY 6 Valves 1/4" VCR #1649A
Herion 8208080.8050, 82080808050, 8R5006A18A120, SHIPSAMEDAY#1649Y
Hevi-Duty Transformer TYPE HS, 120/240V, 1PH, 500KVA, HS20F500A, shipsameday
Hevi-Duty Transformer TYPE HS, 120/240V, 1PH, 500KVA, HS20F500A, shipsameday
Heyco & T&B Liquid Tight Conduit Fittings Miscellaneous (Lot of 60) #106B
HHK Renco Encoders Servo Motor 01482-1089-000-01, 120794-2752, Shipsameday#125B6
Hirose Conn FPC/FFC 17pos, FH26-17S-0.3SHW(05), HFQ317CT-ND, Lot Of 25, E#80
Hirose Conn FPC/FFC 17pos, FH26-17S-0.3SHW(05), HFQ317CT-ND, Lot Of 25, E#80
Hirose Conn Recept 30 Pos 2mm, DF11Z-30DS-2V(20), DF11Z30DS, Lot Of 148 #139N
Hirose Conn Receptacle 3260-8S1, H11349-ND, Lot Of 193, F#33
HISVacuum NW100 ISO flexible hose 6", VCIS100FB6, SHIPSAMEDAY, Rack L#L47
HOFFMAN HOLE SEAL, AS150, A-S150, SHIPSAMEDAY #1629A12
HOFFMAN HOLE SEAL, AS150, A-S150, SHIPSAMEDAY #1629A12
Hoke Ball Valve 1/4", 7122G4Y, Shipsameday E#5
Hoke Bellow Valve 1/4" FVCR, N/O, 0361N4Y2, 0466A4, Shipsameday #ZE24
HOKE needle valve 1/4", 3712G4Y, SHIPSAMEDAY #1541Q1
Hokuyo Automatic Optical Data, DM-HM1, DMHM1, Shipsameday #120Z16
Hokuyo Automatic Optical Data, DM-HM1, DMHM1, Shipsameday #120Z16
Honeywell 09637701, Measurex PIDP, 209403, 09437701, Rev D. Shipsameday#1168J
Honeywell 14504812001, 14504812-001, Shipsameday# 1226D
Honeywell 14504812001, 14504812-001, Shipsameday# 1226D
Honeywell 24295, SHIPSAMEDAY #1643A32
Honeywell 30754419-002, 30754419002, Missing 1 Teflon Gasket Shipsameday, #1220F
Honeywell Cap Assy Kit, 30755956-501, 30755956501, Shipsameday # 1220A
Honeywell DEFINITE PURPOSE CONTACTOR, DP3060B1008, 3 Pole 60amp 120V #1538N
HonEYWELL GCP-31A Circuit Breaker Protector SHIPSANEDAY#1543A12
Honeywell Industrial Pressure Sensors 100PC/200PC, 161PC01D80, 9616353 #1635Q
Honeywell Limit Switch LMA-21-01J, LMA2101J, Shipsameday#1559B12 Box 2
Honeywell LSZ3K, Free Shipping, SHIPSAMEDAY W-2-3 DaysShipping#1644AF
Honeywell Meter Replace 9110, 30752118501, 30752118-001, Shipsameday, #1220E
HonEYWELL MICRO SWITCH 8LS1 Limit FlexCable, NNB #1646B22
HonEYWELL MICRO SWITCH Limit, 1LS53, shipsameday with 2-3 day shipping #1628A12
Honeywell Micro Switch Model 973AA4XM-A7T-L, 973AA4XMA7TL, SHIPSAMEDAY #137F37
HonEYWELL MICRO SWITCH PHOTOELECTRIC CP18RBAD2 ShipSameDay W/2-3DaysShip#1615A10
HonEYWELL MICRO SWITCH SZL-VL-D Limit Switch, 5a, 250vac #1643a11
HonEYWELL MICRO SWITCH SZL-VL-D Limit Switch, 5a, 250vac #1643a11
HonEYWELL MICROSWITCH GSAB20C LIMIT SWITCH, shipsameday w/2-3 day ship #1628A13
Honeywell Mirco Switch GLEA01C, shipsameday W/2-3daysshipping #1538V
Honeywell Output Module 621-6350R, Y839292900001, Shipsameday#1612B6
Honeywell Output Module 621-6350R, Y839292900001, Shipsameday#1612B6
Honeywell Power Input PWA Module 30756669-002, DC3300, Shipsameday#1612B5
HonEYWELL PROXIMITY SENSOR 973AA2XM-A7T-L, CR215DB12SA4HB, SHIPSAMEDAY #137F35
Honeywell SENSOR PRESS VACUUM GAUGE 100 PSI, 19C100PV2K, SHIPSAMEDAY, #Q68
Honeywell Sieger Sensor 00705-1733, BN1084389, Class 1, Shipsameday#154A6
Honeywell Sieger Sensor 00705-1733, BN1084389, Missing O-Ring, Shipsameday#154A7
Honeywell SKINNER SOLENOID VALVE 3/16 ORFICE, 24V, 712156SN2SN00N0H111C2 #1472D
Honeywell Smart Temp STT 3000, LNSC7400W, EN29-P0T-T2, Shipsameday #1220H
Honeywell Temperture Sensor, LP915A, LP915A-1044-3, Shipsameday 137G #28
Honeywell Temperture Sensor, LP915A, LP915A-1044-3, Shipsameday 137G #28
HonSBERG NM-007HP-1, NM007HP1, SHIPSAMEDAY #1622AS
Horiba ES-71 30004860 Portable Conductivity Resistivity Salnity TDS Meter#1647C4
HORIBA Injection Valve, 0190-36237, IV-2410AV-02H, SHIPSAMEDAY#134A5
