184-05710

184-05710

184-05710

184-05710

184-05710

 但是由于这8种现场总线采用的通信协议完全不同，因此，要实现这些总线的兼容和互操作是十分困难的。其可能的出路是采用已经是通用的国际标准Ethe、TCP/IP等协议，并使其符合工业应用的要求，而且这种方案 容易被广大国家的用户、集成商、OEM及制造商接受和欢迎。
但是要把Ethe用于工业自动化，有以下4个问题需要解决：
1、实时性问题。由于Ethe采用CSMA/CD碰撞检测方式，网络负荷较大时，网络传输的不确定性不能满足工业控制的实时要求。但据测试，在典型的工业应用中，其峰值负载在500K左右，相当于10M Ethe的5%，或100M Ethe的0.5%，而Ethe只有当负载达40%以上时才会有明显的延迟现象。同时，目前已经开发出多种有用方法以提高以太网相关组件及软件的速度，并使数据的发送和接受更可靠。这其中 有前途的解决方案是IEEE1588标准 时间协议 (Standard Precision Time Protocol，PTP)。
2、Ethe如何满足现场环境问题。Ethe所用的接插件、集线器、交换机和电缆等是为办公室应用而设计的，不符合工业现场恶劣环境的要求。为了解决在不间断的工业应用领域，在极端条件下网络也能稳定地工作的问题，目前已有多家公司专门开发和生产了DIN导轨式收发器、集线器和交换机系列产品，并有冗余电源供电，接插件采用牢固的DB-9结构，如美国科动控制系统公司和国内的东土电信等。
3、在工业控制中使用Ethe如何获得技术支持。在工业以太网的应用层，有四种标准获得了广泛的支持和应用：施奈德公司：ModTCP/IP (1998) 是目前工业以太网的事实标准，并使以太网在传感器级和设备级得到了大量的应用；德国西门子公司：PROF (2001)；美国Rockwell自动化公司： Ethe/IP (2000)；基金会现场总线FF：HSE (2000)。

3140-01017 AMAT BEARING LINEAR PILLOW BLOCK

3140-01020 AMAT Bearing

3140-01022 AMAT hing Isolator

3140-01034 AMAT Bearing

3140-01034 AMAT BALL HING

3140-01035 AMAT Bearing

3140-01052 AMAT BSHG SNAP-IN.625ID

3140-01088 AMAT HING TAPERED

3140-01127 AMAT BSHG ROLLER ASSY (SPARE FOR 0190-77171)

3140-01127 AMAT HINGROLLERASSY

3140-01134 AMAT HING 1" SHAFT

3150-00105 AMAT CAM 50D INTEGRAL SEAL

3150-01001 AMAT CAM FOLLOWER

3150-01003 AMAT CAM FOLLOWER 5/8W 1/4-28 STUD

3150-01004 AMAT CAM FOLLOWER 5/8" X .440" M

3150-01005 AMAT Bearing

3150-98002 AMAT CAM FOLLOWER 19 O/Dx6 I/Dx14

3160-00074 AMAT SMARTPROBE ASSUP CHEM. NORYL RETAINER

3160-00075 AMAT SMARTPROBE GAMMA CHEM. NORYL RETAINER

3160-00076 AMAT SMARTPROBE SUPP CHEM. NORYL RETAINER

3160-00078 AMAT CAP 3"DIA 2-3/16"HT 26 GA 302 SST PLAI

3160-00080 AMAT CAP TBG 1/4"OD TUBE FLARETEK SPACESAVER

3160-00081 AMAT CAP TBG 3/8"OD TUBE FLARETEK SPACESAVER

3160IN11 AMAT KIT CH3 STD BODY HEATER GAS-LINE

3160MF12 AMAT KIT MAINframe

3180-00026 AMAT LATCH CPRSN FH LIFT & TURN ADJ PAWL B

3180-00041 AMAT LATCH LIFT & TURN

3180-00044 AMAT LATCH BAIL HANDLE LOCKING

3180-00060 AMAT LOCK ASSEMBLY

3180-00061 AMAT ROD LOCK 1041mm

3180-00063 AMAT LATCPRESSIONSLOTTEDLGE

3180-00067 AMAT CATCH 2 PART SPRUNG BALL

3180-00083 AMAT LATCH BAIL HANDLE NON-LOCKING

3180-01016 AMAT LATCH O/C CLAMP SST 60 LB TOGGLE

3180-01045 AMAT LATCH FH MOUNT H-PULL

3180-01045 AMAT LATCH FH MOUNT H-PULL

3180-90016 AMAT DOOR LATCH

3190-51003 AMAT CHAIN ROLLER RS40 114LKS 1

3200-00046 AMAT FRONT FLEXICOVER LOWER ELECTRICAL BOX 30

3200-00282 AMAT FINGER GUARD KIT 80KV ISO TX

3200-01001 AMAT CHAS CASE 2 X 4.61 X 3.10 MULTI-MOD

3200-01054 AMAT DWR 20" SLIDE LENGTH 531LB LOAD PRECIS

3200-01078 AMAT PLATE. BLANK PANEL FOR

3200-01087 AMAT PNL 5.25" DISK DRIVE BLANK-OFF FILLER

3200-90216 AMAT CAB..LIFT&TURN LOCK LATCH

3210-01004 AMAT CL SLIP .375OD FIXED TORQUE 30LB-IN O

3210-51001 AMAT CLUTCH

3220-00006 AMAT CPLG NEO-FLEX 11MM X 8MM 20.6MMOD X 32

3220-00028 AMAT CPLG JNT CYLINDER UNIVERSAL M8 W/FOOT BR

3220-00037 AMAT CPLG ZERO BACKLASH SERVO 14MM X 1/2"BORE

3220-00049 AMAT CPLG SHAFT 6MM X 8MM BORE 26MMOD X 32MML

3220-00077 AMAT CPLG SHAFT 9.5MM X 9.5MM BORE 34.9MMOD

3220-00078 AMAT CPLG FLOATING JOINT M8X1.25 BORE 20MM

3220-00084 AMAT CPLG KEYED SHAFT 14MM & 8MM 30MM OD FLEX

3220-00084 AMAT CPLG KEYED SHAFT 14MM & 8MM 30MM OD FLEX

3220-00084 AMAT

3220-00092 AMAT CPLG SHAFT 1/4 X 8MM BORE

3220-00128 AMAT CPLG SHAFT 5MMBORE X 16MMOD X 23MMLG SST

3220-01006 AMAT CLAMP THROTTLE VALVE SHAFT

3220-01028 AMAT CLAMP GAS TUBE COLLAR

3220-01029 AMAT BELLOWS KF40 3"

3220-01032 AMAT COUPLING SHAFT HEXOD

3220-01036 AMAT COUPLING SHAFT 1/4 BORE

3220-01037 AMAT COUPLING ADAPTOR SHAFT 1/8ID 1

3220-01045 AMAT Quick Disconnect

3220-01066 AMAT CPLG SHAFT 3/4"BORE 3/16"KEYWAY 2.60 L

3220-01066 AMAT CPLG SHAFT 3/4"BORE 3/16"KEYWAY 2.60 L

3220-01066 AMAT CPLG SHAFT 3/4"BORE 3/16"KEYWAY 2.60 L

3220-01066 AMAT CPLG SHAFT 3/4"BORE 3/16"KEYWAY 2.60 L

3220-01066 AMAT 17.55

3220-01066 AMAT 17.55

3220-01066 AMAT 17.55

3220-01066 AMAT 17.55

3220-01077 AMAT LIFTPINBELLOWSCOUPLERS

3220-01089 AMAT CPLGQDISC 1/2" BODY FEM 2.85LG X 1.75DIA 316SST

3220-01104 AMAT CPLG FLEX CLAMP .2498BORE X .500OD DELR

3220-01124 AMAT CPLG SHAFT FLEX 1-5/8 X 1-5/8 BORE ALUM

3220-01130 AMAT Coupling

3220-01146 AMAT CPLG SHAFT 14MM & 8MM 30MMOD FLEX SST

3220-01146 AMAT

3220-01147 AMAT CPLG SHAFT 8MM & 6MM 25MMOD FLEX INT-CL

3220-01147 AMAT CPLG SHAFT 8MM & 6MM 25MMOD FLEX INT-CL

3220-01149 AMAT CPLG 8MM L-SHAFT X 6MM CIRC SHAFT 1"OD

3220-01157 AMAT CPLG SHAFT 6MM X 8MM BORE CLAMP-TYPE

3220-01157 AMAT

3220-90000 AMAT CLR CLAMPING

3220-90004 AMAT COUPLING PANAMECH 1/4" BORE

3220-90011 AMAT COUPLING CENTRE SECTION

32-30026-00 AMAT AIR CYLINDER 3/4BX1/2S

32-30106-00 AMAT CYLINDERAIR 9/16BX7.5S

32-30107-00 AMAT CYLINDER 6.5" BIMBA

32-30108-00 AMAT AIR CYLINDER 1.13BX.75S

32-30111-00 AMAT ROD PISTON CLEVIS

3230-90000 AMATPRESSOR COUPLING (TO JOIN

3240-00018 AMAT FTGD CONN LIQ-TIGHT 2" 90DEG THERMOPL

3240-00062 AMATDUMBILICAL COVER ASM

3240-00081 AMATD FLEX E-CHAIN 1.18"W X 1.89"R PLSTC B

3250-00037 AMAT 90MM VESSEL 780ML NATL PP

3250-00038 AMAT 40MM VESSEL 150ML NATL PP

3250-00039 AMAT VESSEL 90MM W/0.5" SIGHT TUBE 780ML NA

3250-00076 AMAT CHARGE TUBE ADDITIVE VOLUME MEASUREMENT

3250-01007 AMAT DE-IONIZER TANK

3250-01007 AMAT DE-IONIZER TANK

3250-01008 AMAT Fitting DI Tank

3250-01010 AMAT WAFER CARRIER 5" WAFER

3250-01010 AMAT WAFER CARRIER 5" WAFER

3250-01016 AMATTNR WFR CARR FOR CASSETTE 125MM STAT P