描述
DCS控制系統(tǒng)中的I/O
控制系統(tǒng)需要建立信號(hào)的輸入和輸出通道,這就是I/O。DCS中的I/O一般是模塊化的,一個(gè)I/O模塊上有一個(gè)或多個(gè)I/O通道,用來連接傳感器和執(zhí)行器(調(diào)節(jié)閥)。
DCS的控制單元:一個(gè)過程控制站是有幾個(gè)機(jī)架組成,每個(gè)機(jī)架可以擺放一定數(shù)量的模塊。CPU所在的機(jī)架被稱為CPU單元,同一個(gè)過程站中只能有一個(gè)CPU單元,其他只用來擺放I/O模塊的機(jī)架就是I/O單元。I/O單元與CPU是通過現(xiàn)場(chǎng)總線連接的。
常用的I/O信號(hào)一般分為:AI–模擬量輸入信號(hào);AO–模擬量輸出信號(hào);DI–數(shù)字量輸入信號(hào);DO–數(shù)字量輸出信號(hào)。
#?DCS系統(tǒng)的選型設(shè)計(jì)調(diào)試
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