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
PARKER VERIFLO IR400S4PG PRESSURE REDUCING REGULATOR
NOS! PARKER REMOTE PRESSURE VALVE CC1225B
LOT PARKER VERIFLO PRESSURE TRANSDUCER SWITCH DWYER
Parker Oil Pressure Regulator Control Valve A4AL; *A7
Parker high pressure clamp flange elbow 41775-16-16
Parker 41575 16-16 Clamp SAE flange high pressure 1 in
Parker Pressure Regulator P3NRA1PBPP
Parker 035682000B Pressure Regulator
Parker Veriflo 944AOPLPNOSFSFF High Purity Low Pressure
PARKER HIGH PRESSURE BALL VALVE # BV3H06S2SS1N
PARKER 035662000B PRESSURE REGULATOR 5-125 PSIG NEW
Pressure Pump Inlet Filter **NEW** Part#1J2-5
Parker Flo-Con Pressure Regulator A7-A
PARKER H2 1/2″ SAFETY PRESSURE RELIEF VALVE REFRIGERANT
Parker 73212BN52N00 3/4″ Skinner Pressure Vessel 2-Way
Parker Scrader Bellows Pressure Regulator 035662000B