IC697MEM715B
1．PLC的类型
PLC按结构分为整体型和模块型两类，按应用环境分为现场安装和控制室安装两类；按CPU字长分为1位、4位、8位、16位、32位、64位等。从应用角度出发，通常可按控制功能或输入输出点数选型。整体型PLC的I/O点数固定，因此用户选择的余地较小，用于小型控制系统；模块型PLC提供多种I/O卡件或插卡，因此用户可较合理地选择和配置控制系统的I/O点数，功能扩展方便灵活，一般用于大中型控制系统。
2．输入输出模块的选择
输入输出模块的选择应考虑与应用要求的统一。例如对输入模块，应考虑信号电平、信号传输距离、信号隔离、信号供电方式等应用要求。对输出模块，应考虑选用的输出模块类型，通常继电器输出模块具有价格低、使用电压范围广、寿命短、响应时间较长等特点；可控硅输出模块适用于开关频繁，电感性低功率因数负荷场合，但价格较贵，过载能力较差。输出模块还有直流输出、交流输出和模拟量输出等，与应用要求应一致。可根据应用要求，合理选用智能型输入输出模块，以便提高控制水平和降低应用成本。考虑是否需要扩展机架或远程I/O机架等。
3.电源的选择
PLC的供电电源，除了引进设备时同时引进PLC应根据产品说明书要求设计和选用外，一般PLC的供电电源应设计选用220VAC电源，与国内电网电压一致。重要的应用场合，应采用不间断电源或稳压电源供电。如果PLC本身带有可使用电源时，应核对提供的电流是否满足应用要求，否则应设计外接供电电源。为防止外部高压电源因误操作而引入PLC，对输入和输出信号的隔离是必要的，有时也可采用简单的二极管或熔丝管隔离。
4.存储器的选择
由于计算机集成芯片技术的发展，存储器的价格已下降，因此，为保证应用项目的正常投运，一般要求PLC的存储器容量，按256个I/O点至少选8K存储器选择。需要复杂控制功能时，应选择容量更大，档次更高的存储器。
RHP 30mm Take UP bearing, 13.5mm slot, 1305-25G,
SNR J1035 35GFS 35mm 2 Bolt Flange Bearing No
MRC Bearings 211R, 55mmID x 100mmOD x 21mm
Timken 45284 bearing only
Seal Master TB-24, 1 1/2" Tapped Base Bearing,
Torrington NTA-2435, Lot of 5 Bearings, in Box
Martin 60BS19, Sprocket 1" bore,
Timken Fafnir 5205K, Bearing, in Box
MCGILL, MS 51962 11, MI 16, Lot of 4, Bearings,
Timken 3120B, Stepped CUP , in Box
McGill FC4-25-1 1/4", 4 bolt Flang Bearing, in BOX
CR services 12700, lot of 11,
SNR 1225 25G, 25mm 2 Bolt Flange Bearing No
Timken 3193, 1 1/4" bore bearing
Martin DS40A15, Sprocket 3/4" bore,
INA LR5204KDD, 20mm Bearing
INA AS150190 Raceway Washer, 150mm x 190mm x 1mm
Browning VF2S-119, 2 Bolt Flange 1 3/16" Bearing
Hub City, TU220X1-7/16, Mounted Takeup Bearing, in
MB Bearings FC4-25 1 3/4" 4-bolt flange bearing NE
Timken 47490, Tapered Bearing,
RBC S32LCam Follower, 1" OD x .625"WD Lot of 3
42A42 Metric Sprocket, .76" rough bore, Lot of 2
Fafnir 9112PP, Bearing, in Box
Martin 50B27, Sprocket, 1" bore, 1/4" key
INA bearing KB2558PP, in box
US Tsubaki Power Lock 1 3/16 - 240107, Locking hub
IKO locking collar, PL 2 1/2", 2 1/2" ID x 3
Thomson A122026SS, Ball Bushing
The General, 55500, Precision Ball & Roller Bearings, L
Timken Fafnir 2707WN SU Bearing, in Box
Pacific Bearing PB12C, 3/4" ID, Closed Bearing, Ne
Dodge 124463, TBSC014, 7/8" tapped Base Flange Bearin
Fafnir VAS 1 3/16" Pillow Block Bearing in Box
Timken JH415610, CUP , in Box
IKO SBB20 Ball Bushing 1 1/4" x 2" x 1"w lot of 2
INA IR22X28X30, Inner Race 22mm, lot of 3 In Box
Peer 40MM Take up bearing, UCT208 40M 11/16, in Box
MRC 5202SBKF-H502 Bearing, 15mmID x 35mm x 15.9mmW
INA Bearing# K80X86X20A, Roller style
Koyo 5208CD3, 40mm x 80mm x 30mm Bearing
Martin 50BTB25-2012, Sprocket, #50, 25T
Fafnir 9107PP Bearing in
SKF, 6208-2RSJEM, Lot of 2, Bearings,
Gates, P20XL037, Lot of 2, Powergrips Timing Pully, 782
Timken JM822010, CUP , in Box
Timken, 55200C, Tapered Roller Bearing,
Koyo 25520, Cup, Lot of 3, in Box
Timkin 18520, Cup, Lot of 3, in Box
Timkin 527, Cone Bearing, in Box
NSK Bearing UCF204, N AV2S, 3/4" 4 bolt Flange Bearing,
CR Services, 21640, Seals lot of 6
Nachi 6213, C8*061226, 068-1914-647, Bearing, Made in
Nachi 6213ZZ, Bearing, Made in Japan,
Fafnir 5205K, 25mm x 52mm Ball Bearing
Timken YAK 15/16 Pillow Block Bearing
INA / MPB GT14 Thrust Bearing, 1.316ID x 2.344OD
INA B3 Bearing .753" ID x 1.469 OD x .625W lot of 2
Martin 1B66SDS QD bushed sheave 6.95" OD
Thomson, Super 20 OPN, Ball Bushing Linear Bearing,
INA bearing NK28/20, 28mmOD x 37mmID x 20mm
Nice 7520-DLTN Bearing, MADE in USA,
Hub City 1" Take-Up Bearing,TU250x1?, in Box
Fafnir VCJ-3/4 4 Bolt Flange Bearing in Box
Fafnir 210K Bearing, 50mmID x 90mmOD x 20mmW,
Timken 32304 tapered roller bearing,
IKO TLAM2220 Needle Bearing, 22mm x 28mm lot of 5
Martin 50A27, plate sprocket, Lot of 2, rough bore
Martin 60BS16 Sprocket, 1 1/2" bore, 3/8" key
Browning 60JA13, Bored for QD hub
Martin 60B12 Sprocket, 1 1/4" bore, 1/4" key
Browning 20HB100, TIMMING BELT PULLEY, 1 1/8" BORE
Timken Fafnir 25572, Bearing, in Box
Fenner Drives 620803, Tran touque, 16mm bore x 38mm OD,
Dodge, P2B-SC-110, Bearing, Pillow- 1 5/8", Setscrew Lo
Hub City, PB250X1/2, Pillow Bearing, 1/2" Bore, Self-Al
Morse BK47x1/2, 1/2" idle pulley, 4L or 5L sheave
Martin / Browning 50B19 5/8" bore , Lot of 2
Martin DS60A14, Sprocket 1" bore
Dodge FB-SC-012, 3/4" 3 bolt flange Bearing
Timkin 25821, Cup, Lot of 2, in Box
Timkin 30306M, 9/KM1, Cup and Cone Bearing, in Bo
Hub City PB250x1 1" pillow block bearing 2 set scre
Mcgill MI30 bearing race LOT OF 2
Brewer 40B19 Idle, Sprocket, 1" ID needle bearing, Idle
Browning H60P21 Taper Lock Sprocket
MB Manufacturig MFB1-38, 3 bolt Bearing, in BOX
MB Manufacturig MFB-7/8, 3 bolt Bearing, in BOX
INA GH20, Linear Bearing support 20mm,
LM/TARBELL L2438-24, Bearing,
McGill MR32, 2.5625" OD x 1.25" Wide Needle Bearing
Nice 1640DC, Bearing in Box TNTG18
50A20, plate sprocket, .625 rough bore
SKF 6209-2ZJEM, Bearing, in Box
Martin 40BS13HT, Sprocket 1" bore,
60B15 Sprocket, 1 3/8" bore, .312" key,
Sprocket 40A32, #40, 32 teeth, .625 bore, USA
McGill MR12RSS, 1.25" OD x 1" WD, Needle Bearing
Timken Bearing 15106, 1.0625" in Box
Ametric 46B14, 3/16" bore Metric Sprocket
Action Emerson UBPFL204 Bearing, 20mm Bore, 2 bolt flan
Timken Fafnir 15520 Race
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