描述
DCS控制系统中的I/O
控制系统需要建立信号的输入和输出通道,这就是I/O。DCS中的I/O一般是模块化的,一个I/O模块上有一个或多个I/O通道,用来连接传感器和执行器(调节阀)。
DCS的控制单元:一个过程控制站是有几个机架组成,每个机架可以摆放一定数量的模块。CPU所在的机架被称为CPU单元,同一个过程站中只能有一个CPU单元,其他只用来摆放I/O模块的机架就是I/O单元。I/O单元与CPU是通过现场总线连接的。
常用的I/O信号一般分为:AI–模拟量输入信号;AO–模拟量输出信号;DI–数字量输入信号;DO–数字量输出信号。
# DCS系统的选型设计调试
UNDERWRITER’S LAB CIRCUIT BREAKER TRIP UNIT, JT3125T
WATLOW Heater Imersion 5KW, 220v, Z6643
Leitz Wetzlar PL Fluotar 32x/0.75 567039
Leitz Wetzlar PL Fluotar 20x/0.45 567012
Leica ∞/- PL Fluotar optics 10x/0.25 567010
KLA Instruments 81B Assembly 710-659465-20
LAM, Coupling Leveling Ring, 853-210621-308
BALDOR Assy PUMP Motor W/viton 34H609W315G1
NEC 10.5″ LCD Display NL6448BC33-59
PALL Fairy Ring Filter KC-GDF6406E
Allied Motion / Emoteq Leadscrew Assy, E3-1000-250-I
FRABA ABSOLUTE ANGLE ENCODER 5813-4096-FBA1DP03PG
Eurotherm AC Servo Motor, PGH07
BIORAD 8″ Cassette, QS600, 013-5363-3
MKS MANOMETER, 0-10, 1/4 VCR, 124AA
EUROTHERM AMPSTACK, 70 AMP, 208 AC, AS-1
TIMNTA INPUT FILTER 3L+N+E, FMAD-0937-8010
EUROTHERM CONTROLLER, 461082
NT INTERNATIONAL FLOW THRU PRESSURE TRANSDUCER
WARRENDER PVDF WET END, WE5002/ICS
MKS MANOMETER, TYPE 128, 128AA-00010B
Humphrey Solenoid Bank ST053101CJ-02
3 way/port valve
Futurestar FLOWMETER 5 GPM 1/2″ Anolog Odyssey
Master Interface PCB w/optional Arcom 123626
Lambda LND X 152 12-15 Volt Regulated Power Supply 2.5A
APPLIED MATERIALS QUARTZ COVER 125mm POLY, 0200-10044
APPLIED MATERIALS Ring, top, 125 mm flat, 0200-00157
COORS Tek, SEMI WAFER. CEL 8.62, 41120-87756-010
Entegris Replacement element kit and wire guards 213-75
Entegris 3/4″ PFA Hand Valve KC-201-41-01
Applied Materials Shield, Lower, 8″, 0200-250