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。

BOBST 704-1337-01 PC BOARD

BODINE ELECTRIC B10 W/43110411PAW PC BOARD DC DRIVE TERMINAL

BOFORS ELEKTRONIK H-2-KCA BOARD

BOFORS H-2-KG CIRCUIT BOARD

BOHERS H-2-KC-1 1131721A CIRCUIT BOARD

BOHERS H-2-KG 1133459 AMPLIFIER BOARD

BOMAC INC 11S1-65 CIRCUIT BOARD

BOMAN INC 11S01-00065-01 CIRCUIT BOARD

Bonitron 3438C2D3 Pcb Circuit Board

Bonitron 3460D4G Pcb Circuit Board

Bonitron 3460V2A46 Pcb Circuit Board

Bonitron 3460X4A1 Pcb Circuit Board

Bonitron 3534G1A Scr Gate Trigger Pcb Circuit Board

Bonitron 3534I2B Pcb Circuit Board

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Bosch CNC Control Card CP/MEM4-1 No. 1070068998-102 Board Fd : 12W19 Unit

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Bosch Module 064972-2027 Component Board Z-No 1070064971-202 Platine Unit

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Bosch Rexroth Output Card 1070050634-211 PC 400/600 Sps Output Module V 3

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Boser HS-5620 Isb Industrial Single Board Computer Isa 586 V/l/sound 100m

BO-SHERREL 70010 CIRCUIT BOARD

BOSTON 104786701 SNUBBER/TRIGGER BOARD

BOSTON BGW-D-62289-G CONTROL CARD

BOSTON DIGITAL B-017 CIRCUIT BOARD

BOSTON SNUBBER/TRIGGER BOARD 1055910

Bot Engineering C14-PCBD-50CC Pcb Circuit Board

Bot Engineering C14-PCBF-50CC Flow Vac Pcb Circuit Board 50ml/min Rev 0.0

Bot Engineering ES-MS3004-PN-AC-PCB Pcb Circuit Board

Bot Engineering ES-MS3004-PN-DPC-PCB Pcb Circuit Board

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Bot Engineering RM-SM-2100002 Flow Averaging Display Pcb Board

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Bot Engineering RM-SM-3000008-02 Power Supply Pcb Board

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BR AUTOMATION RESOLVER 8BAC0122.000-1 BOARD/CARD MODULE

Brabender BT1082R1 Pcb Circuit Board

Brabender BT1182 Pcb Circuit Board

Brabender BT2161-E4/A1 Pcb Circuit Board

BRAMSON SC1040 CIRCUIT BOARD

BRAMSON SC1060 CIRCUIT BOARD

Brand

BRANSON 100-242-275 ULTRASONICS BOARD

BRG BRG7X160TC-ENH MESSAGE BOARD

bridge 87-0097-01 90-0032-06 V35 Card

BRIDGE 87-0698-01-0X-A V.24 RS232 Card

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BRIDGE 87-1582-01-26-D, 90-4927-01/J 28LC CARD

bridge Alcatel Data Com Processor Card 90-0670-01 87-0155-01

Bridge Clock Card 90-0641-01/E 87-0184-01-37-A

BRIDGE SWITCHING CARD 90-0640-03/D 90-0661-01/D 87-0195-01-20-B

Bridgeport 134199A Regulator Pcb Circuit Board

Bristol Babcock 392004-03-8 Analog Input Pcb Circuit Board

Bristol Babcock 392906-11-2 Cpu Board

Broadcom CN-OXK104-72200-36R-01P6-A02 Network Card

BROOKS INSTRUMENT J.097-B.068 REV. E BOARD

BROOKS S097Y247AAA CONTROL BOARD

Brother B521111-5 Pcb Motherboard

Brother B52J052-200A Pcb Circuit Board