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IMDSI22
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DCS或TDCS
（1）分散控制系统DCS与集散控制系统TDCS是集4C（Communication，Computer， Control、CRT）技术于一身的监控技术。
（2）从上到下的树状拓扑大系统，其中通信（Communication）是关键。
（3）PID在中断站中，中断站联接计算机与现场仪器仪表与控制装置。
（4）是树状拓扑和并行连续的链路结构，也有大量电缆从中继站并行到现场仪器仪表。
（5）模拟信号，A/D—D/A、带微处理器的混合。
（6）一台仪表一对线接到I/O，由控制站挂到局域网LAN。
（7）DCS是控制（工程师站）、操作（操作员站）、现场仪表（现场测控站）的3级结构。
（8）缺点是成本高，各公司产品不能互换，不能互操作，大DCS系统是各家不同的。
（9）用于大规模的连续过程控制，如石化等。
（10）制造商：Bailey（美）、Westinghous（美）、HITACH（日）、LEEDS & NORTHRMP（美）、SIEMENS（德）、Foxboro（美）、ABB （瑞士）、Hartmann & Braun（德）、Yokogawa（日）、Honewell（美国）、Taylor（美）等。
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ALLEN BRADLEY 770XZ LITHIUM BATTERY 3.6V /2AA
ALLEN BRADLEY 772-M6 CORE MEMORY MODULE USED WORKING CONDITION GUARANTEED
ALLEN BRADLEY 772-ME6 MEMORY MODULE EXCELLENT USED CONDITION
ALLEN BRADLEY 772-MS MEMORY SEGMENT MODULE (2048 WORD RAM) USED CONDITION
ALLEN BRADLEY 7735-46-52 MEMORY CARD RETAINER IN PACKAGE
ALLEN BRADLEY 775CX CHASSIS EXPANSION CABLE SET
ALLEN BRADLEY 775-GA COMMUNICATION MODULE EXCELLENT USED CONDITION
ALLEN BRADLEY 775-GA PERIPHERAL COMMUNICATION MODULE CONDITION
ALLEN BRADLEY 775-GA PERIPHERAL COMMUNICATION MODULE CONDITION
ALLEN BRADLEY 775-MEA ERROR CORRECTING 64K RAM USED
ALLEN BRADLEY 775-MEA ERROR CORRECTING 64K RAM USED
ALLEN BRADLEY 775-MED B ERROR CORRECTING RAM 28K USED CONDITION
ALLEN BRADLEY 775-MED CORRECTING RAM MEMORY BOARD NOS CONDITION /
ALLEN BRADLEY 775-MED ERROR CORRECTING RAM MEMORY BOARD 28K USED CONDITION
ALLEN BRADLEY 775-MR8 MEMORY MODULE EXCELLENT USED CONDITION
ALLEN BRADLEY 775-MX MEMORY COMMUNICATION MODULE REPAIRED/REFURBISHED
ALLEN BRADLEY 77-ASB REMOTE I/O ADAPTER MODULE 9602987 USED WORKING CONDITION
ALLEN BRADLEY 77-EC 2 BIT ANALOG INPUT EXPANDER LNC
ALLEN BRADLEY 77HT3 E-STOP IO TERMINATION PANEL P/N 967060 CONDITION
ALLEN BRADLEY 77HTE ENCODER TERMINATION PANEL CONDITION IN PACKAGE
ALLEN BRADLEY 77HTE ENCODER TERMINATION PANEL CONDITION IN PACKAGE
ALLEN BRADLEY 77-IA 20VAC INPUT MODULE 77IA LNC
ALLEN BRADLEY 77-IB 2-24VDC INPUT MODULE 77IB LNC
ALLEN BRADLEY 77-IDC 20V AC/DC ISOL INPUT MODULE LNC
ALLEN BRADLEY 77-IQC 5-30VDC INPUT MODULE SER B LNC
ALLEN BRADLEY 77-KA COMMUNICATION ADAPTER MODULE USED CONDITION
ALLEN BRADLEY 77-KA COMMUNICATION ADAPTER MODULE USED CONDITION
ALLEN BRADLEY 77-OA AC OUTPUT MODULE 20V EXCELLENT USED CONDITION
ALLEN BRADLEY 77-OQ6 ISOL OUTPUT MODULE 24VDC LNC
ALLEN BRADLEY 77-P2 POWER SUPPLY MODULE REFURBISHED
ALLEN BRADLEY 77-P2 POWER SUPPLY MODULE USED
ALLEN BRADLEY 77-PA POWER SUPPLY MODULE USED
ALLEN BRADLEY 77-WA SWING ARM 0 TERMINAL
ALLEN BRADLEY 77WH WIRING TERMINAL STRIP
ALLEN BRADLEY 785-KA COMMUNICATION ADAPTER MODULE 785KA EXCELLENT CONDITION
ALLEN BRADLEY 786 CONTROL-NET COAX TAP KIT ACCESSORIES *LESS TAPS* IN PKG
ALLEN BRADLEY 792D-CB8 / 792D-8BVT0D LOGIC DEVICE NET MODULE
ALLEN BRADLEY 794-IA8 INPUT MODULE 8 INP 20VAC
ALLEN BRADLEY 794-OB6 FLEX I/O OUTPUT MODULE 9622875 WITH TERMINAL BASE NNB
ALLEN BRADLEY 79-IOVW I/O MODULE 24VDC DISTRIBUTED EXCELLENT USED CONDITION
ALLEN BRADLEY 79-IOVW I/O MODULE 24VDC DISTRIBUTED EXCELLENT USED CONDITION
ALLEN BRADLEY 800064KDC CMOS RAM PC BOARD 906882-7 USED CONDITION
ALLEN BRADLEY 800-4DL3 FULL VOLTAGE MODULE WITH LATCH NOS CONDITION IN PACKAGE
ALLEN BRADLEY 80064KDD MEMORY BOARD 64K !!!
ALLEN BRADLEY 80064KDD MEMORY BOARD 64K !!!
ALLEN BRADLEY 800E-2DL5 FULL VOLTAGE MODULE WITH LATCH 800E2DL5 IN PACKAGE
ALLEN BRADLEY 800E-2DLT5X FULL VOLTAGE MODULE NIP
ALLEN BRADLEY 800E-2LX CONTACT CARTRIDGE WITH LATCH IN PACKAGE
ALLEN BRADLEY 800E-2LX CONTACT CARTRIDGE WITH LATCH IN PACKAGE
ALLEN BRADLEY 800E-2LX0 CONTACT CARTRIDGE NC IN PACKAGE
ALLEN BRADLEY 800E-2LX20 CONTACT CARTRIDGE 2NO IN PACKAGE
ALLEN BRADLEY 800E-2LX20 CONTACT CARTRIDGE 2NO IN PACKAGE
ALLEN BRADLEY 800E-3D0 FULL VOLTAGE LAMP MODULE !!
ALLEN BRADLEY 800E-3DL3 FULL VOLTAGE MODULE WITH LATCH 800E3DL3 IN PACKAGE
ALLEN BRADLEY 800E-3LX CONTACT CARTRIDGES WITH LATCH NOS IN PACKAGE
ALLEN BRADLEY 800E-3TL5G TRANSFORMER MODULE WITH LATCH NOS CONDITION IN PACKAGE
ALLEN BRADLEY 800EM PUSHBUTTON-PILOT LIGHT SET CONDITION
ALLEN BRADLEY 800EM-F30W GREEN "START" PB NIB!!!
ALLEN BRADLEY 800EM-F30W GREEN "START" PB NIB!!!
ALLEN BRADLEY 800EM-G2 GUARDED BLACK PUSHBUTTON
ALLEN BRADLEY 800EM-G2 GUARDED BLACK PUSHBUTTON
ALLEN BRADLEY 800EM-KR35 OPERATOR KEYED SELECTOR SWITCH CONDITION
ALLEN BRADLEY 800EM-LE3 ILLUMINATED PUSBUTTON GREEN
ALLEN BRADLEY 800EM-LE4 PUSHBUTTON RED
ALLEN BRADLEY 800EM-LE7 ILLUMINATED EXTENDED PUSH BUTTONS (SET OF 2) NOS
ALLEN BRADLEY 800EM-MM4 RED MUSHROOM HD PUSHBUTTON CONDITION IN PACKAGE
ALLEN BRADLEY 800EM-MMP24 RED MUSHROOM PUSHBUTTON IN PACKAGE
ALLEN BRADLEY 800EM-MP24 MUSHROOM PUSHBUTTON RED NIP
ALLEN BRADLEY 800EM-MP24 MUSHROOM PUSHBUTTON RED NIP
ALLEN BRADLEY 800EM-SM32 SELECTOR SWITCH BLACK NIP
ALLEN BRADLEY 800EP-KM33 SELECTOR SWITCH CONDITION IN PKG
ALLEN BRADLEY 800H-AK2A PUSHBUTTON BLACK 600VAC 0A NIB
ALLEN BRADLEY 800H-FPX9A TYPE 7&9 2-POSITION PUSH-PULL PUSHBUTTON
ALLEN BRADLEY 800H-FPXP6C HAZ. LOCATION PUSHBUTTON NNB
ALLEN BRADLEY 800MR-A2B SMALL ROUND BLACK PUSHBUTTON 2 NO 2 NC
ALLEN BRADLEY 800MR-A2D FLUSH ROUND BLACK PB NO
ALLEN BRADLEY 800MR-A2D2 FLUSH BLACK PUSHBUTTON NC
ALLEN BRADLEY 800MR-A2DK SMALL ROUND PUSH BUTTON BLACK CAP N.O.
ALLEN BRADLEY 800MR-A9AK SMALL ROUND PUSH BUTTON YELLOW CAP
ALLEN BRADLEY 800MR-A9AK SMALL ROUND PUSH BUTTON YELLOW CAP
ALLEN BRADLEY 800MR-A9DK YELLOW PUSHBUTTON NO
ALLEN BRADLEY 800MR-D9 OPERATOR PUSH BUTTON SWITCH 0-300V
ALLEN BRADLEY 800MR-FXQ24XS ILLUMINATED GREEN PUSHBUTTON WITH LAMP NNB
ALLEN BRADLEY 800MR-FXQL24RA RED PB LIGHT 22mm NIB!!!
ALLEN BRADLEY 800MR-FXQL24RAS RED LED ILLUMINTAED PUSH-PULL UNIT
ALLEN BRADLEY 800MR-H33B OPERATOR ONLY KEYED SELECTOR SWITCH NNB
ALLEN BRADLEY 800MR-H3B KEYED SELECTOR SWITCH 2 POSITION MAINTAINED
ALLEN BRADLEY 800MR-H3B KEYED SELECTOR SWITCH 2 POSITION MAINTAINED
