福建中立恒自动化设备有限公司
1.输入/输出单元
输入/输出单元通常也称I/O单元或I/O模块,是PLC与工业生产现场之间的连接部件。
PLC通过输入接口可以检测被控对象的各种数据,以这些数据作为PLC对被控制对象进行控制的依据;同时PLC又通过输出接口将处理结果送给被控制对象,以实现控制目的。
由于外部输入设备和输出设备所需的信号电平是多种多样的,而PLC内部CPU的处理的信息只能是标准电平,所以I/O接口要实现这种转换。
I/O接口一般都具有光电隔离和滤波功能,以提高PLC的抗干扰能力。另外,I/O接口上通常还有状态指示,工作状况直观,便于维护。
PLC提供了多种操作电平和驱动能力的I/O接口,有各种各样功能的I/O接口供用户选用。I/O接口的主要类型有:数字量(开关量)输入、数字量(开关量)输出、模拟量输入、模拟量输出等。
常用的开关量输入接口按其使用的电源不同有三种类型:直流输入接口、交流输入接口和交/直流输入接口。
常用的开关量输出接口按输出开关器件不同有三种类型:是继电器输出、晶体管输出和双向晶闸管输出。
继电器输出接口可驱动交流或直流负载,但其响应时间长,动作频率低;而晶体管输出和双向晶闸管输出接口的响应速度快,动作频率高,但前者只能用于驱动直流负载,后者只能用于交流负载。
PLC的I/O接口所能接受的输入信号个数和输出信号个数称为PLC输入/输出(I/O)点数。I/O点数是选择PLC的重要依据之一。当系统的I/O点数不够时,可通过PLC的I/O扩展接口对系统进行扩展。
2.通信接口
PLC配有各种通信接口,这些通信接口一般都带有通信处理器。
PLC通过这些通信接口可与监视器、打印机、其它PLC、计算机等设备实现通信。
PLC与打印机连接,可将过程信息、系统参数等输出打印;与监视器连接,可将控制过程图像显示出来;与其它PLC连接,可组成多机系统或连成网络,实现更大规模控制。
与计算机连接,可组成多级分布式控制系统,实现控制与管理相结合。远程I/O系统也必须配备相应的通信接口模块。
3.智能接口模块
智能接口模块是一独立的计算机系统,它有自己的CPU、系统程序、存储器以及与PLC系统总线相连的接口。
它作为PLC系统的一个模块,通过总线与PLC相连,进行数据交换,并在PLC的协调管理下独立地进行工作。
PLC的智能接口模块种类很多,如:高速计数模块、闭环控制模块、运动控制模块、中断控制模块等。
BELCO 1248-00 CIRCUIT BOARD A5B1248-00 124800
BELCO 1248-00 CIRCUIT BOARD A5B1248-00 124800
BELCO MSA7002A01 DISPLAY BOARD
BELCO MSA7002A01 DISPLAY BOARD
BELCO MSA7002A01 DISPLAY BOARD
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BELL & HOWELL CS-538-000B CPU BOARD REV.2 CS538000B
BELL & HOWELL CS-538-000D CIRCUIT BOARD CS538000D
BELL & HOWELL CS-538-000D CIRCUIT BOARD CS538000D
BELL & HOWELL CS-538-000D CIRCUIT BOARD CS538000D
BELL & HOWELL CS-538-000D CIRCUIT BOARD CS538000D
BELL & HOWELL CS-538-000E CIRCUIT BOARD CS538000E
BELL & HOWELL CS-538-000E CIRCUIT BOARD CS538000E
BELL & HOWELL CS-538-000F BACK PANEL BOARD REV.1 CS538000F
BELL & HOWELL CS-538-000F BACK PANEL BOARD REV.1 CS538000F
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BELL & HOWELL CS-538-000F BACK PANEL PC BOARD CS538000F
BELL & HOWELL CS-538-000F BACK PANEL PC BOARD CS538000F
BELL & HOWELL CS-538-000F BACK PANEL PC BOARD CS538000F
BELL & HOWELL CS-538-000F BACK PANEL PC BOARD CS538000F
BELL & HOWELL CS-538-000F BACK PANEL PC BOARD CS538000F
BELL & HOWELL CS-538-000G CIRCUIT BOARD CS538000G 937002058
BELL & HOWELL CS-538-000G CIRCUIT BOARD CS538000G 937002058
BELL & HOWELL CS-538-000J PC BOARD CS538000J
BELL & HOWELL CS-538-000J PC BOARD CS538000J
BELL & HOWELL CS-538-000M PC BOARD CS538000M
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BEMAC ULB33A-B1 QJN0021 Annunciator Pcb Card Uzushio Electric
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BEMAC ULB33A-B1 QJN0021 Annunciator Uzushio Electric I C2 UC1003H
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BEMAC ULB33A-B1 QJN0021 Annunciator Uzushio Electric I C2 UC1003H
BEMAC ULB3T Annunciator DC24V Uzushio Electric
BEMAC ULB3T Annunciator DC24V Uzushio Electric
BEMAC ULB3T Annunciator DC24V Uzushio Electric
BEMAC ULB3T Annunciator DC24V Uzushio Electric
BEMAC ULB3T Annunciator DC24V Uzushio Electric
BEMAC ULB3T Annunciator DC24V Uzushio Electric
BEMAC ULB3T Annunciator DC24V Uzushio Electric
BEMAC ULB3T Annunciator DC24V Uzushio Electric
BEMAC ULB3T Annunciator DC24V Uzushio Electric
BEMAC ULB3T Annunciator DC24V Uzushio Electric
BEMAC UST-206-D PCB UST-206D UST206D
BEMAC UST-206-D PCB UST-206D UST206D
BEMAC UST-206-E PCB CARD 1321E
BEMAC UST-206-E PCB CARD 1321E
BEMAC UST-206-E PCB CARD 1321E
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Bemac uzushio bs-mb0102 pcb card 1625
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BEMAC UZUSHIO BS-TB01 05 PCB CARD MODULE NEW
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BEMAC UZUSHIO BS-TB01 05 PCB CARD MODULE NEW
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BEMAC UZUSHIO BS-TB01 05 PCB CARD MODULE NEW
BEMAC UZUSHIO BS-TB01 05 PCB CARD MODULE NEW
BEMAC UZUSHIO ELECTRIC CO TYPE BG-PLC GENERATOR NETWORK CONTROLLER
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BEMAC-UZUSHIO UNT-202-2 MICROCOMPUTER SYSTEM
BEMAC-UZUSHIO UNT-202-2 MICROCOMPUTER SYSTEM
BEMAC-UZUSHIO UNT-202-2 MICROCOMPUTER SYSTEM
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BENDER PCB BM1000 B92024001 / FAST SHIP DHL OR FEDEX
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BENDER PCB BM1000 B92024001 / FAST SHIP DHL OR FEDEX
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BENDIX 3730269 PC BOARD
BENDIX 3730269 PC BOARD
BENDIX 3730269 PC BOARD
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BENDIX T3730267 CIRCUIT BOARD
BENDIX T3731777 PC BOARD
BENDIX T3731777 PC BOARD
BENDIX T3731777 PC BOARD
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BENSHAW BIPC-300013-01-1 MICRO STARTER RELAY BOARD REV 1
BENSHAW BIPC-300013-01-1 MICRO STARTER RELAY BOARD REV 1
BENSHAW BIPC-300016-01 MEDIUM VOLTAGE PULSE CARD REV 3
BENSHAW BIPC-300016-01 MEDIUM VOLTAGE PULSE CARD REV 3
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BENSHAW BIPCM1PWR REDISTART MICRO POWER CARD PC-1350 REV.6
BENSHAW BIPCMB-C1 MICRO BYPASS CARD REV 15 BIPCMBC1
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BENSHAW BIPCMRELAY CIRCUIT BOARD PC-1361
BENSHAW INC. PCRS6BAK PC BOARD
BENSHAW INC. PCRS6BAK PC BOARD
BENTLY NEVADA 102618-01 SIGNAL/POWER INPUT CARD 10261801
BENTLY NEVADA 102618-01 SIGNAL/POWER INPUT CARD 10261801
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