IC655ALG516RR GE
模块的外部表现就是它的工作状态的种种显示、种种接口及设定或控制开关。一般讲,模块总要有相应的状态指示灯,如电源显示、运行显示、故障显示等。箱体式PLC的主箱体也有这些显示。它的总线接口,用于接I/O模板或底板,有内存接口,用于安装内存,有外设口,用于接外部设备,有的还有通讯口,用于进行通讯。模块上还有许多设定开关,用以对PLC作设定,如设定起始工作方式、内存区等。
二、I/O模块:
PLC的对外功能,主要是通过各种I/O接口模块与外界联系的,按I/O点数确定模块规格及数量,I/O模块可多可少,但其大数受所能管理的基本配置的能力,即受大的底板或机架槽数限制。I/O模块集成了PLC的I/O电路,其输入暂存器反映输入信号状态,输出点反映输出锁存器状态。
三、电源模块:
有些PLC中的电源,是与模块合二为一的,有些是分开的,其主要用途是为PLC各模块的集成电路提供工作电源。同时,有的还为输入电路提供24V的工作电源。电源以其输入类型有:交流电源,加的为交流220VAC或110VAC,直流电源,加的为直流电压,常用的为24V。
四、底板或机架:
大多数模块式PLC使用底板或机架,其作用是:电气上,实现各模块间的联系,使能访问底板上的所有模块,机械上,实现各模块间的连接,使各模块构成一个整体。
五、PLC的外部设备
外部设备是PLC系统不可分割的一部分,它有四大类
Parker high pressure clamp flange elbow 41775-16-16
Parker 41575 16-16 Clamp SAE flange high pressure 1 in
Parker Pressure Regulator P3NRA1PBPP
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PARKER FP2AUS14 250 PRESSURE 1.000 STROKES AIR
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Parker Veriflo 1/4″ Pressure Regulator (SQ2MICRO130E60)
PARKER REMOTE PRESSURE VALVE CC1225B 150 PSI DO 1/4″
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3 NEW PARKER MANAPAK PRESSURE CONTROL VALVES PRM2PP07KN
LOT 2 PARKER PRESSURE REGULATOR MASTER PNEUMATIC FILTER
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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 REGULATOR 400 PSI
A810E Parker FLOCON 1-3/8″ Outlet Pressure Regulator
2683 NEW Parker 201673 Pressure Regulator
PARKER HYDRAULIC PRESSURE REDUCING VALVE V-21 FT
New Parker CPOM2AAV55X Pilot-Oper. Pressure Check Valve
NIB PARKER BVHP16SSS1NA HIGH PRESSURE BALL VALVE
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Parker 035643000B Pressure Regulator NEW Free Shipping
Parker Hydr. Pressure Reducing Module D03 # BD03PNR-A
PARKER 1/4 NPT CONTROLLED PRESSURE SAFETY THUMB LEVER
Parker hydraulic cylinder model C2H19 PRESSURE 3000
New Parker 06E21A18AC Filter Regulator w/Pressure Gauge
Parker 3/8″ S. Air Dual Pressure Switch New