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。

以下链接皆有货

SCHINDLER SLCUX 2.Q 594212 ELEVATOR PCB CARD SLCUX 21.Q 594216

SCHINDLER TEMPO 01 PCB CARD 694992

SCHINDLER VE 22 MB PCB CARD 444 249

SCHINDLER WVV 31.MB PCB CARD 444 241

SCHISCHEK REDBOX-Y/S TERMINAL BOX MAX 275V 10A

SCHISCHEK REDMAX-30-SF ACTUATOR 24-240V AC/DC

SCHLEICHER 06000625 489 081 KZT310 TIMING MODULE

SCHLEICHER 06002519 543 102 KZT310 TIMING MODULE

SCHLEICHER KLB4.02.200.504/A PCB CARD 4.02.200.504

SCHLEICHER KSTE-KS-2K/A-U PCB CARD KLL KSTE-KS-KR-2K/A/B

SCHLEICHER KSTE-KS-2K/A-U PCB CARD KSTE-KS-KR-2K/A/B

SCHLEICHER MDA 207 PCB CARD 4.02.200.207/B

SCHLEICHER MDE 212-24 PCB CARD 4.02.200.212/B

SCHLEICHER SXT 12 VOLTAGE MEASURING RELAY R3.185.0030.0

SCHLEICHER SXT-12 (A) VOLTAGE OR CURRENT MEASURING RELAY 18500792 374 064

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Schmersal safety cable switch ZS 71 1Ö/1S VD / 71.1.41.5.01

Schmersal Safety Relay SRB301LC/B 24V / *GB14048.5/50Hz

Schmersal Safety Rope Pull Switch ZS 71 1Ö/1S VD / 71.1.41.5.01

Schmersal Safety Sensor BNS 260-02Z-ST-L / *101184377

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Schneider Altivar 32 ATV32H075M2 Frequency Inverter - 0.75 kW

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Schneider ATV312H037N4 Variable speed drive, 0.37kW (0.5HP), 380..500V, 3-ph

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Schneider ATV340U55N4 variable speed drive - 5.5kW - 400V - 3-ph - Modbus serial

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Schneider Electric Altivar 212 Type: ATV212HU55N4 - 5.5 kW / 032249

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