描述
从时间调度上来说。
PLC的程序一般不能按事先设定的循环周期运行。PLC程序是从头到尾执行一次后又从头开始执行。(现在一些新型PLC有所改进,不过对任务周期的数量还是有限制)而DCS可以设定任务周期。比如,快速任务等。同样是传感器的采样,压力传感器的变化时间很短,我们可以用200ms的任务周期采样,而温度传感器的滞后时间很大,我们可以用2s的任务周期采样。这样,DCS可以合理的调度控制器的资源。
从网络结构发面来说。
一般来讲,DCS惯常使用两层网络结构,一层为过程级网络,大部分DCS使用自己的总线协议,比如西门子和ABB的Profibus、ABB的CAN bus、施耐德的Modbus等,这些协议均建立在标准串口传输协议RS232或RS485协议的基础上。现场IO模块,特别是模拟量的采样数据(机器代码,213/扫描周期)十分庞大,同时现场干扰因素较多,因此应该采用数据吞吐量大、抗干扰能力强的网络标准。基于RS485串口异步通讯方式的总线结构,符合现场通讯的要求。
IO的采样数据经CPU转换后变为整形数据或实形数据,在操作级网络(第二层网络)上传输。因此操作级网络可以采用数据吞吐量适中、传输速度快、连接方便的网络标准,同时因操作级网络一般布置在控制室内,对抗干扰的要求相对较低。因此采用标准以太网是最佳选择。TCP/IP协议是一种标准以太网协议,一般我们采用100Mbit/s的通讯速度。
PLC系统的工作任务相对简单,因此需要传输的数据量一般不会太大,所以常见的PLC系统为一层网络结构。过程级网络和操作级网络要么合并在一起,要不过程级网络简化成模件之间的内部连接。PLC不会或很少使用以太网。
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主营DCS系统配件
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2005 Ingersoll 3 – Axis Slide w/ 22,000 RPM Spindle
60″ John Ramming NC/CNC Rotary Table, Mod TT-5301-120-A
Tennant 265 Riding Floor Sweeper, Good Condition
Advance Hydro-Max II Riding Scrubber / Sweeper
6,000 Lb. Hyster E60XM-33 Electric Lift Truck
Allen Bradley Module, 8520-1S5A-BAT-EX4-T1-Y-4-5-7
12″ x 24″ #373 Gallmeyer & Livingston Grinder, 1969
Fanuc Spindle Amplifier Module A06B-6044-H130 WARRANTY
Siemens Processor Digital Board R15C02D186 WARRANTY
Yokogawa Daq Station, DX220-2, Style S2
5,000 Lb. Hyster E50XM Electric Lift Truck W/O Battery
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2,700 Lb. Clark 3-Wheel Electric Lift Truck W/ Battery
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METTLER TOLEDO HI-SPEED CHECKMATE 2 CHECKWEIGHER
Fanuc Velocity Control Unit, # A06B-6050-H401 WARRANTY
ABB Millmate Controller Unit 400W 3BSE017233R1 WARRANTY
K & T / Gemini D Control Module Power Supply 1-2197701
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Fanuc AC Spindle Motor A06B-0859-B200 Model 22 WARRANTY
38″ Ferguson H D variable Speed Rotary Table, WARRANTY
Allen Bradley AC Drive w/Enclosure 1336-B020-EDE WARRAN
Fanuc AC Spindle Motor A06B-1030-B200 Model 30 WARRANTY
Allen Bradley AC Servo Motor 1326AB-B740E-21-L WARRANTY
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NEW Xycom Touch Screen Control / Monitor, Mod# 9465 KPM
New Weltronic Welding Controller, GH3-30600-2, Mfg’d 00
Rexroth Indramat Servo Motor MHD112B-048-PPO-BN, 284595
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6×18 Boyar-Schultz H618 Grinder w/ Electro Chuck & Dust
MECOS MBE3-50 Trumpf Laser Magnetic BEARING CONTROLLER
Fanuc AC Spindle Servo Unit A06B-6055-H106, WARRANTY
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Rexroth Servo Drive Unit, DKCXX.3-040-7 WARRANTY
Hitran 220 KVA 3 Phase Transformer, Cat# D3012243H6
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Indramat Power Supply, # TVM 2.1-50-220/300-W1-115/220
ALLEN BRADLEY 6160-T53 A Programming Terminal 6160T53
Fanuc AC Spindle Servo Unit A06B-6055-H103, WARRANTY
Barber Colman Cartridge Module 80BE-00036-101-V-00
New Yaskawa AC Spindle Motor, 15/11 KW UAASKA-15LYA110E
Fanuc Servo Amplifier Unit, #A06B-6090-H223, WARRANTY
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Allen Bradley Size 5 Rev Starter Cat# 505-FOD WARRANTY
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Sugino Selfeeder CNC Self-feeding Drill, Mod # MSX-IFBE
Barber Colman Heat/Cool Module 80GA-10103-001-V-00
Barber Colman Parison Control 80JA-10001-001-0-00
Sugino Selfeeder DRILL S26011 .75 KW HP. 240/480 V
Fanuc AC Servo Motor, # A06B-0147-B075 WARRANTY
Acme 167 KVA Transformer T-1-53023-3S, 240/480 120/240
VOLLAND Spindle Drive Motor, VD0KFF-I3Z-L46 912-15945
Motor Type A2D 250-AA-02-01 WARRANTY
VOLLAND Spindle Drive Motor, VD0KFF-132-146 912-15943
Motor Type A2D 250 WARRANTY
Allen Bradley 1747-L542P Processor Unit, Ser B WARRANTY
ALLEN BRADLEY Industrial Computer, 6180-ABEBEBACBBZ
Yaskawa Type# GEER-K DC Spindle Motor, USED, Warranty
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Allen Bradley 1326 AC Servo Motor 1326AB-B430E-21-K4
6″ x 18″ Reid 618HA Hand Feed Grinder, w/ Perm. Chuck
General Numeric / Fanuc AC Spindle Motor A06B-1006-B600
Gould Cyberline 1000, CL113, Brushless Servo Drive
Okuma LB-15 Turning Center Headstock & Spindle
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Yaskawa Spindle MT2 Control PCB JPAC-C061 WARRANTY
Allen Bradley AC Servo Motor 1326AB-B3E-11-A7 * RFB *
6x18x2-13/16″ Walker Fine Electromagnetic Chuck & Contr
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GE Fanuc AC Servo Motor, #A06B-0502-B755, Warranty
GE Fanuc AC Servo Motor, #A06B-0501-B755, Warranty
Allen Bradley AC Drive 1336S-B010-AA-EN-HA1-L6 Ser A
Hoffman APW/McLean Electronic Air Cond M17-0216-G009H
Yaskawa Type# GEKR DC Spindle Motor, 11/15 KW Warranty
#20S GE Fanuc AC Servo Motor # A06B-0502-B002 WARRANTY
12″x24″x3-1/16″ Walker Fine Electro Chuck & Controller
24″ Feeler Single Spinde Geared Head Drilling Machine
Allen Bradley 1336 Drive 1336S-B015-AA-EN-GM1-HAP-L6
Mitsubishi FREQROL- A200 FR-A240-5.5K-UL WARRANTY
Giddings & Lewis Module MMC-SD-4.0-460, M.1302.5095
Kearney & Trecker Interface Board 1-2069702 WARRANTY
STI 38″ Mini Safe-B Light Curtain Set, Series MS4436B
Sola Mini/Micro Computer Regulator 63-23-220-8 WARRANTY
Fanuc AC Servo Motor Mod 1-OSP A06B-0373-B169 WARRANTY
Fanuc Servo Amplifier Unit, #A06B-6066-H281, WARRANTY
GE Fanuc AC Servo Motor, #A06B-0147-B675, Warranty
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Okuma Opus 5000 Main Card3, E4809-045-038-C, WARRANTY
Fanuc Servo Amplifier A06B-6090-H223 Missing Guards
K & T / Gemini D Control Module # 1-2197600, Rev. 5
Mitsubishi Spindle Amplifier MDS-B-SPA-H150R MDS-B-SPA
Fanuc Transformer, A80L-0022-0007 A80L00220007, Used
Turbo Conveyor / Coolant System, Mod# 6275-8140,. Nice
Reliance AC Servo Motor, # 1326AB-B520F-21-K5 WARRANTY
Modicon Cyberline 1000 Servo Drive 110-093, WARRANTY
McLean Thermal MHB11-0416-G307 Air Conditioner WARRANTY
Siemens Solid 100 HP State Starter, 3RW2-M14N, WARRANTY
Yaskawa AC Spindle Drive Motor, EEA-1KM, Nice, WARRANTY
Giddings & Lewis Servo Unit, Model# DS130 401-34201-34
Okuma LB-15 Turning Center Tailstock, Complete
NEW Siemens AC Servo Motor, 1FT5076-0AC01-1-Z WARRANTY
Yaskawa PCB CPCR-MR-HM-06GG DC SERVO DRIVES WARRANTY
K & T / Gemini D Memory Board # 1-21271 03
K & T / Gemini D Memory Board # 1-21271 02
Allen Bradley Servo Controller 1391-DES22-DI-AQB WARRAN
Fanuc Velocity Control Unit, # A06B-6050-H103, WARRANTY
GE Fanuc AC Servo Motor, # A06B-0172-B575 , Warranty
GE Fanuc #30F AC Servo Motor, #A06B-0357-B756, Warranty
GE Fanuc #10 AC Servo Motor, #A06B-0501-B756, Warranty
Okuma Servo Motor, Type# BL-MC300J-20S, * Warranty *
Fanuc Servo Amplifier Unit, #A06B-6066-H223, WARRANTY
Fanuc Servo Amplifier Unit, #A06B-6057-H007, WARRANTY
GE Fanuc AC Servo Motor, #A06B-0146-B675, Warranty
FANUC DCR/DBR Discharge Unit A05B-2302-C080 Warranty
Fanuc Terminal Unit A02B-0056-C796 A02B0056C796
Getty’s / Gould Spindle Drive Unit, GMC Mark VI 66-1330
Sumitomo Induction Motor w Brake 3Ph 1HP 230/460V NEW
Total Control Products Smartscreen MMI20300C1A, Ser B
Hoffman APW/McLean Electronic Air Cond M13-0116-G1014H
AB Panelview 1000E, Cat# 2711E-K10C6, Rev C WARRANTY!
Getty’s Permanent Magnet Servo Motor 16-0371-10 WARRANT
Modicon Interface Panel, Panelmate Plus, MM-PMA2-400
Cutler-Hammer Panelmate Epro 8.4 Color TFT, 7585T-8-OPC
Atlas Copco QCM-T 340 25, 4240033781,, Nice
ABB GME PC Board DSQC 236G YB560103-CD/24 56M009G
GE Fanuc 5F AC Servo Motor A06B-0346-B357, W Encoder
EZ LOADER BISHAMON PIVOT TABLE 46″ x 45″ 4500 LBS MAX
Cutler-Hammer Operator Interface Panel Mod# D7XMN14
1000LBS Max Air Caster Corp.Tilt Table 48″ x 84″ D12230
Indramat AC Servo Motor, # 071C-0-JS-3-C/095-B-2/S001
Mitsubishi PC Board FW17A, BN624A486G51, Rev C
Graseby Digital Superstart 50HP AC Drive DST50V4B3N*DB
Giddings & Lewis 6 Axis Pendant, # M.1018.3035
Eaton IDT Operator Interface 36PK PM3000 Power Series
Indramat AC Servo Controller Unit BZM01.3-01-07
Giddings & Lewis 6 Axis Pendant, # M.1018.3035
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Okuma OPUS 5000 Board E4809-032-496-E 1911-1171-27-72
Okuma Servo Unit for BL-80E-20 Motor, E4809-045-061-D
Fanuc AC Servo Motor, # A06B-0147-B175 WARRANTY
Okuma CRPB-II Board # E4809-436-013-D, WARRANTY
Fanuc Interface Adapter, A13B-0073-C001, A14B-0075-B120
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FANUC PC Axis Control Board A16B-1211-0061 WARRANTY
Mitsubishi FREQROL- A200 FR-A240E-5. 5K-UL WARRANTY
Allen Bradley 1326 AC Servo Motor, # 1326AB-B2E-11-A5
Allen Bradley Panelview 1200, Cat# 2711-KC1X, Rev D
Square D 700 Amp Circuit Breaker MAL36700 WARRANTY
Fanuc Robot Teach Pendant, #A05B-2301-C300,
Air Caster Corp Lift & Tilt Table 48″ x 44″
EZ LOADER BISHAMON PIVOT TABLE 44″ x 48″ 3000 LBS MAX
NEW Allen Bradley Dataliner Interface, # 2706-E43J32B1
Allen Bradley 9 Series10 KW Systems Module, 8520-S10
w/Board 8520-1APA1
Allen Bradley 9 Series10 KW Systems Module, 8520-S10
Siemens DC Circuit Board 6RB2025-0FA01
Fanuc AC Servo Motor, Model 1-OSP, # A06B-0373-B069
FANUC AC Servo Amplifier Unit, A06B-6089-H101, B
Giddings & Lewis Module Unit MMC-SD-0.5-23, M.1302.8130
Okuma Opus 5000 Main Board, E4809-045-035-C WARRANTY
Allen Bradley Error Correcting Memory Board 1775-ME4
Indramat Servo Drive Motor, # 90C-0-GD-4/110-A-0/GR277
Mitsubishi PC Board FX31D, BN624A550G51, Rev A
FANUC A16B-2200-0470 / 10B BASE 1 Board WARRANTY
Fanuc AC Servo Motor, Model M6/3000, # A06B-0162-B175
Okuma Servo Motor, Type# BL-120E-20, * Warranty *
MITSUBISHI SERVO DRIVE TRA41A, WARRANTY
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