DL1200变流器
在PLC控制系统中，电源占有极重要的地位。电网干扰串入PLC控制系统主要通过PLC系统的供电电源（如电源、I/O电源等）、变送器供电电源和与PLC系统具有直接电气连接的仪表供电电源等耦合进入的。现在，对于PLC系统供电的电源，一般都采用隔离性能较好电源，而对于变送器供电的电源和PLC系统有直接电气连接的仪表的供电电源，并没受到足够的重视，虽然采取了一定的隔离措施，但普遍还不够，主要是使用的隔离变压器分布参数大，干扰能力差，经电源耦合而串入共模干扰、差模干扰。所以，对于变送器和共用信号仪表供电应选择分布电容小、带大（如采用多次隔离和屏蔽及漏感技术）的配电器，以减少PLC系统的干扰。


位保证电网馈点不中断，可采用在线式不间断供电电源（UPS）供电，提高供电的安全可靠性。并且UPS还具有较强的干扰隔离性能，是一种PLC控制系统的理想电源。
2电缆选择的敖设
为了减少动力电缆辐射电磁干扰，尤其是变频装置馈电电缆。笔者在某工程中，采用了铜带铠装屏蔽电力电缆，从而降低了动力线生产的电磁干扰，该工程投产后取得了满意的效果。


上世纪60年代后期，根据当时汽车市场需求和计算技术的发展，在美国麻萨诸塞州Bedford的Bedford Associates,向美国汽车制造业提议开发一种Modular Digital Controller（MODICON）取代继电控制盘。其它一些公司也建议以计算机为基础的方案。其核心思想是采用软件编程方法代替继电控制的硬接线方式，并备有生产现场大量使用的输入传感器和输出执行器的接口，以便于进行大规模生产线的流程控制。这就是以后被称为Programmable Logic Controller的由来。MODICON 084是世界上种投入商业生产的PLC。
0年代是PLC崛起，首先在汽车工业获得大量应用，在其它产业部门也开始应用的时期。80年代是它走向成熟，采用微电子及微处理器技术；大量推广应用，并奠定其在工业控制中不可动摇地位的时期。在此阶段PLC销售始终以两位数百分点的速度增长，前六年的增长率超过35%，后四年稳定发展，年增长率约12%。90年代又开始了它的第三个发展时期。随着PLC的IEC 61131的正式颁布，推动了PLC在技术上发动新的突破：在系统体系结构上，从传统的单机向多和分布式及远程控制系统发展；在编程语言上，文本化和图形化的语言多样性，创造了更具表达控制要求、文字处理、通信能力的编程环境。
从应用范围和应用水平上，除了继续发展机械加工自动生产线的控制系统外，则是发展以PLC为基础的DCS系统、监控和数据采SCADA系统、柔性制造系统（FMS）、安全联锁保护（ESD）系统、运动控制系统等，地产提高PLC的应用范围和水平。


进入90年代后期，由于用户对开放性的强烈要求和压力，由于信息技术的大力推动，PLC如果还停留在原有的专用而又封闭的系统概念上，它将坐以待毙。于是PLC进入了其发展的第四阶段。其特征是：

HAM-LET UNION ELBOW 1/2T HEX-BODY SST SV4 LOT OF 2
HANNIFIN SST-2 NSPP SST2
HANNIFIN SST-4    SST4
HCAK204-12 SST           Ball Bearing Pillow Block
HCAK205-16 SST           Ball Bearing Pillow Block
HCAK207-22 SST           Ball Bearing Pillow Block
HCAK207-23 SST           Ball Bearing Pillow Block
HCAK208-25 SST           Ball Bearing Pillow Block
HCAK209-26 SST           Ball Bearing Pillow Block
HCAK209-28 SST           Ball Bearing Pillow Block
HCFS208-24 SST           Ball Bearing Flange Unit
HCFT205-16 SST           Ball Bearing Flange Unit
HCFT207-22 SST           Ball Bearing Flange Unit
HCP204-12 SST           Ball Bearing Pillow Block
HCP205-14 SST           Ball Bearing Pillow Block
HCP205-16 SST           Ball Bearing Pillow Block
HCP206-20 SST           Ball Bearing Pillow Block
HCP207-22 1-3/8" SST Ball Bearing Pillow Block -          
HCP207-22 1-3/8" SST Ball Bearing Pillow Block -          
HCP207-23 1-7/16" SST Ball Bearing Pillow Block -          
HCP207-23 1-7/16" SST Ball Bearing Pillow Block -          
Helical 1/4" x 1/2" Vari. Pitch High Perf. Carbide End Mill w/C.R-SST,Titanium
Helical 1/4" x 1/2" Vari. Pitch High Perf. Carbide End Mill w/C.R-SST,Titanium
Helical 1/4" x 3/4" Vari. Pitch High Perf. Carbide End Mill w/C.R-SST,Titanium
Helical 1/4" x 3/8" Vari. Pitch High Perf. Carbide End Mill w/C.R-SST,Titanium
Helical 1/4" x 3/8" Vari. Pitch High Perf. Carbide End Mill w/C.R-SST,Titanium
Helical 1/8" x 1/2" Vari. Pitch High Perf. Carbide End Mill w/C.R-SST,Titanium
Helical 1/8" x 1/4" Vari. Pitch High Perf. Carbide End Mill w/C.R-SST,Titanium
Helical 3/16" x 5/8" Vari. Pitch High Perf. Carbide End Mill w/C.R-SST,Titanium
Helical 3/16"x5/16" Vari. Pitch High Perf. Carbide End Mill w/C.R-SST,Titanium
Helical 3/8" x 1/2" Vari. Pitch High Perf. Carbide End Mill w/C.R-SST,Titanium
Helical 5/16" x 1/2" Vari. Pitch High Perf. Carbide End Mill w/C.R-SST,Titanium
HIGH QUALITY 1"OD x 0.834"ID x 30" SST 304 Stainless Steel Tube SEAMLESS
HIGH QUALITY 1"OD x 0.87"ID x 36" SST 304 Stainless Steel Tube SEAMLESS
HIGH QUALITY 1.25"OD x 0.938"ID x 19" SST 304 Stainless Steel Tube SEAMLESS
HIGH QUALITY 1.25"OD x 0.938"ID x 30" SST 304 Stainless Steel Tube SEAMLESS
High Quality 400 MESH 12"X12" FILTRATION SS T316 FREE SHIP
HK SYSTEMS .. 4 BOLT CAST IRON HOUSING.. SST XB206-19 C3 KY PILLOW BLOCK BEARING
HK SYSTEMS 4 BOLT FLANGE PILLOW BLOCK C12000, XB206-19, SST, 1-1/8" BORE
HM89446 SST           Taper
HOKE 2315F4Y 2300K1 sst control valve with presicion handle *          NO BOX*
HOKE 2315F4Y sst 3000 psi control valve *          NO BOX*
HOKE 316SST BALL VALVE 2000 PSI 7092G8Y (AISLE B)
HOKE 7387004S MANIFOLD VALVE 316 SST 832
HOKE 7387004S MANIFOLD VALVE 316 SST 832
Hoke Gyrolok 16U316, SST, 1" Union Ref Swagalok Ss-1610-6, 772LSS1, Z#19
Hoke Selecto-Mite 316SST Ball Valve Model 7165F4Y
Hot 10 Packs Dental Endo K-FILE 010/10 Purple 25mm SSt DENTSPLY MAILLEFER CE
HUMMINGBIRD XETRON ( FCC ID:MH9-SST900A)
HUMMINGBIRD-XETRON-FCC-ID-MH9-SST900A
HUMPHREY 6-DP-2 PNEUMATIC CYLINDER 1 1/16 inch bore 2" Stroke SST
HUMPHREY 6-DP-2 PNEUMATIC CYLINDER 1 1/16 inch bore 2" Stroke SST
HYPERTHERM #020940 RETAINING CAPACITY PAC180 30A SST STK 4433
HYPERTHERM #020940 RETAINING CAPACITY PAC180 30A SST STK 4433
Hypertherm 100A SST Inner Retaining Cap 120592 for HD1070 HD3070             Qty: 1
HYPERTHERM 220608 260A SST BEVEL
HYPERTHERM 220608 260A SST BEVEL
Hypertherm Electrode 80A SST - High Perbance - 220339
IC SST 31LF021 70-4C-WH 2 Mbit Flash 70ns & 1 Mbit SRAM 70ns ComboMemory 32-TSOP
IC SST 36VF3203 ND FLASH MPF 32MBIT (x8/x16) 70NS TFBGA48 (6mm x 8mm) 2.7V~3.6V
IC SST 37VF040 70-3С-NHE MT FLASH MPF 4 Mbit (x8) 70NS 32-pin PLCC 2.7V ~ 3.6V
IC SST 39VF6402B 70-4I-EKE ND FLASH MPF 64MBIT (4M x 16) 70NS 48TSOP 2.7V ~ 3.6V
IC SST 55LD019M ATA Flash Disk Controller 5.0V or 3.3V host interface TQFP-100
ICO RALLY SST-26 RED PTFE TEFLON TUBBING 26AWG,RED ROLL OF APPROX 100FT
Ideal-Tridon 300200575051 SS T-Bolt Channel Bridge Hose Clamp 146.1 mm - 10Pack
INDUSTRIAL RETAINING RINGS # 5000-0200SST PK OF 4 INTERNAL SNAP RINGS
INDUSTRIAL RETAINING RINGS # 5000-475SST INTERNAL SNAP RINGS
INDUSTRIAL RETAINING RINGS # 5555-50SST PK OF 24 EXTERNAL SNAP RINGS
INTEGRATED CONTROL 1213C SENSOR FL SST 1/4 FVCR STK G
INTELLIFEED 890025-404 8-1/2 IN LENGTH SST ROLLER CONVEYOR REPLACEMENT B469615
INTERMATIC K4536SST Photocontrol,Locking,105 to 305VAC
INTERMATIC PHOTO CONTROL K4536SST//105-305V
John Deere JD SST15 Spin Steer Mower Tractor Operators Manual
John Deere SST15 SST16 SST18 Spin Steer Lawn Tractor operators manual JDL2
John Deere SST16 SST18 SST 16 18 spin steer tractor owners & maintenance manual
Jonard Industries SST-916 9/16" Security Shield Tool
JONARD SST-916 Security Shield Tool, Steel
JONARD SST-916 Security Shield Tool, Steel
JOSEPH SST-1.12X1.00-4 AIR PNEUMATIC CYLINDER          
K&S PRECISION METALS 7140 Round Rod, SST, 1/4in Dia. x 36 In. L, PK4
K&S PRECISION METALS 7142 Round Rod, SST, 5/16in Dia. x 36 In. L, PK3
K&S PRECISION METALS 7144 Round Rod, SST, 3/8in Dia. x 36 In. L, PK3
KAMLOC 1" SST 634-B OPW TWIN KAM CAP            
KAMLOC 2" SST 634-B OPW TWIN KAM CAP            
KAMLOC 3" SST 634-A MALE CAP OPW
Kamlock Stainless Steel SST 633-D Quick Coupling 1" Female Threaded
KAMLOK * 1" SST TWIN KAM * 733-DL
KAMLOK 5/16 F-05-C SST - OPW TWIN-KAM STAY DOWN ARMS HOSE SHANK
KAMLOK 5/16 F-05-C SST - OPW TWIN-KAM STAY DOWN ARMS HOSE SHANK
KAMLOK 733-CL 1" SST - OPW TWIN-KAM STAY DOWN ARMS HOSE SHANK
KAMLOK 733-CL 1" SST - OPW TWIN-KAM STAY DOWN ARMS HOSE SHANK
Kerotest / Marsh N1314 - 1/2" - SST 316 / 10000PSI Valve WOG
KF-25 (NW-25) to KF-16 (NW-16) Conical Reducer, SST
KNORR BREMISE SST-05B    SST05B
LAM 720-000930-034 SCR SCH CAP 6-32 X2-1/8 LG SST (lot of 8)
LEE SPRING LC-042-E10 SST COMPRESSION SPRING 1IN LENGHT X 3/8IN ID (LOT OF 3)
LIGHT SIGNAL RED/ROUND for Bunn Warmer SST-20 SST-30 Star OEM 2J-Z2329 381461
LOT (4)           NOS! YALE FORKLIFT SST DEEP GROOVE ROLLER BALL BEARINGS 6205ZC3
LOT 6           SST 6203-2RS 2-1/2 IN X 3/4 IN BALL BEARING B247177
LOT OF (2) HYPERTHERM 220338 80A SST SHIELD PLASMA CUTTING PART
LOT OF (2) HYPERTHERM 220339 ELECTRODE 80A SST PLASMA CUTTING PART
LOT OF (2) HYPERTHERM 220606 HPR SST BEVEL ELECTRODE PLASMA CUTTING PART
Lot of (2) SST 6205 Z Single Shielded Bearings 6205Z 25 x 52 x 15mm
Lot of (2) SST R2CZZ Ball Bearings - NOS
Lot of (5) SST 6303 RS Sealed Bearings
Lot of (9) SST 6203 Z C3 Shielded Bearings 17x40x12
Lot of 10 - SST Bearings - 6002RS;
LOT OF 10 SPC TECHNOLOGY SST-024-6010-CLR           3/8" X 2' HEATSHRINK SST0246010CLR
Lot of 10 SST C.P. 1-1/2" X 5/8" Band Clamps          
LOT OF 2 KAMLOK 633-D SST 1" COUPLING QUICK DISCONNECT Stainless Threaded
Lot of 2 RG RAY 700-142           SS T BOLT CLAMP FOR MUFFLER 3/4" W 9-1/4 TO 8-3/4D
Lot of 2 RG RAY 700-142           SS T BOLT CLAMP FOR MUFFLER 3/4" W 9-1/4 TO 8-3/4D
LOT OF 2!! USD PRESSURE GAUGE 4-3/8" 0-60PSI 1/2"NPT SST316
Lot of 3 Hypertherm 220197 Nozzle 130A SST           in Package
Lot of 3 Hypertherm 220197 Nozzle 130A SST           in Package
Lot of 3 Hypertherm 220337 Nozzle Assy 80A SST           in Package