描述
根據(jù)統(tǒng)計(jì)資料表明:在PLC控制系統(tǒng)的故障中,CPU占5%,I/O接口占15%,輸入設(shè)備占45%,輸出設(shè)備占30%,線路占5%。前二項(xiàng)共20%故障屬于PLC的內(nèi)部故障,它可通過PLC本身的軟、硬件實(shí)現(xiàn)檢測(cè)、處理;而其余80%的故障屬于PLC的外部故障。因此,PLC生產(chǎn)廠家都致力于研制、發(fā)展用于檢測(cè)外部故障的專用智能模塊,進(jìn)一步提高系統(tǒng)的可靠性。
Parker Pressure Regulator 72-130
Expedited shipping available
PARKER Flo-Con Pressure Regulator A8-AOE
5 PARKER SENSOCONTROL PRESSURE SWITCH SCPSD-600-04-07
3 NEW PARKER MANAPAK PRESSURE CONTROL VALVES PRM2PP07KN
LOT 2 PARKER PRESSURE REGULATOR MASTER PNEUMATIC FILTER
parker bvhp12bss1na HIGH PRESSURE BALL VALVE
Parker PRM3 PP17K Pressure Reducing Valve 150-2500 PSI
NEW PARKER FLO-CON BYPASS HOT GAS PRESSURE REGULATOR A9
PARKER/SCHRADER BELLOWS PRESSURE REGULATOR 035662000B
PARKER FLO-CON A7 PRESSURE REGU