描述
常见的小区门禁卡原理是:
里面有一个称之为RFID的芯片，当拿着含有RFID芯片的卡片通过卡片阅读机时，卡片阅读机所发射出来的电磁波就会开始读取卡片里面的信息，这里面的信息不但可以读出，而且还可以写入，修改，因此芯片卡不但只是个钥匙它更是张电子身份证。只要在芯片中写入个人数据，在卡片阅读机的地方就可以知道进出的是谁了。
门禁卡基础定义原智能门禁系统由主机、读卡器和电锁组成（联网时中添电脑和通信转换器），读卡圆式属非接触读卡方式，持卡者只有将卡在读卡器邻近（5-15厘米）快捷摆动一次，读卡器才能感应到有卡并将卡中的信息（卡号）引领到主机，主机先进行检讨卡的非法性，而后决议是否进行合门动作。全部进程只要在有效的刷卡范畴内均可实现门禁管理功能。读卡器装置于门边墙内，不影响其它工作。并通过通讯转接器（RS485）与电脑进行实时监控（可由电脑指令启/闭所有门，并可实时查看所有门的状况）、数据解决、查问、报表输入等。
欧美品牌停产的，常用的“PLC”备品备件
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Parker Convum MPS-R3F5-NC Stainless Pressure Sensor New
Convum CVA-DN/CVA-15HS 24BL/C-0054-CVA
Myotoku Convum F-1 Vacuum Ejector C-21-316
Convum VF-3
Convum CVA-15HR-B Vacuum Release Solenoid Valve NNB
CONVUM A QUICK RELEASE VALVE CVA-D NO.EKT(15-19)
Convum MPS-V9M-NG-YOK Sensor
Convum MC2S07HS-ZM24B5?R-8Y19 Valve w/A00SC23-Z06-028
Convum MVS-030-AB Vacuum Sensor NPN MVS030AB NIB
Parker Convum MVS-030ABP PNP Sensor MVS030ABP NIB
Convum VF-6 Pneumatic Port Vacuum Filter NIB
Convum VF-3 vacuum filter assembly 1/8″w/element
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Control Techniques NTM-330-CONS-W024|Servo Motor
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UD71 Serial Module for Control Techniques Unidrive
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2 control techniques controllers and exlar motors used
Emerson/Control Techniques En-214 En214 Servo Drive
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CONTROL TECHNIQUES SP1401 UNIDRIVE 4.1A 380/480V*XLNT*
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Seen On TV!Lotus Shield Anti-Frizz Treatment
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Advance Techniques Frizz Control Lotus Shield
EMERSON CONTROL TECHNIQUES MD-420-00-000&MP1250 PS
AUTOTECH EZ-S6M-R TOUCH SCREEN/AB FLEX 22A-D2P3N104
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CONTROL TECHNIQUES,COMMANDER SE AC DRIVE,SE2D200075
Avon-ADV TECHNIQUES-LOTUS SHIELD FRIZZ CONTROL-NIP
CONTROL TECHNIQUES SECO BOARD MENTOR II MDA-1 7004-0043
AVON ADVANCE TECHNIQUES FRIZZ CONTROL SHIELD-LAST 1
CONTROL TECHNIQUES DYNAMIC BRAKING UNIT***NIB***
Control Techniques Focus 3 Signal Isolator Board NIB
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CONTROL TECHNIQUES V75 ICD FLUX VECTOR DRIVE,REFURBISH
CONTROL TECHNIQUES PWR SUPPLY AND DRIVE MODULE NICE M/O
NIB~Avon Advance Techniques FRIZZ CONTROL Lotus Shield
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