ABB TVOC-2- 240 1SFA664001R1001

数字量输入/输出模块原理

(1)数字量输入模块原理

数字量输入模块用于连接外部的机械触点和数字式电气信号处理器，它将来自于现场设备 如转换开关、限位开关、接近开关、温度传感器、电磁线圈、阀执行机构等)的电气信号转换成一种可由 (PU 处理的电平信号。所有1/0 模块均采用光电隔离方式连接到总线上，且均可由软件配置PLC 的输入电路按外接电源的类型分为直流输入电路和交流输入电路:按 LC输入模块公共端COM 流的流向分为源输入电路和漏输入电路 按光糖发光二极管公共端的连接方式分为共阳极和共阴极输入电路:按接线方式分为汇点式、分组式和分隔式汇点式的各 1/0 电路有一个公共点，各输入点或输出点共用一个电源分组式的 1/0 电路分为若干组，每个组的 /0 电路有一个公共点，各组之间的电路是分开的，可以分别使用不同的电源:分隔式的各 1/0 电路之间都是相互隔离的，每一个/0 均可以使用单独的电源，如图 2-14所示,因此，数字量输入模块分为两种基本的信号类型: 直流信号输入和交流信号输入

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Principle of Digital Input/Output Module

(1) Principle of Digital Input Module

The digital input module is used to connect external mechanical contacts and digital electrical signal processors. It will come from on-site devices such as transfer switches, limit switches, proximity switches, temperature sensors, electromagnetic coils The electrical signals of valve actuators, etc., can be converted into a The level signal processed by PU. All 1/0 modules are connected to the bus through photoelectric isolation, and can be configured by software. The input circuit of the PLC is divided into DC input circuit and AC input circuit according to the type of external power supply. The input circuit is divided into source input circuit and leakage input circuit according to the flow direction of COM flow at the common end of the LC input module. The input circuit is divided into common anode and common cathode according to the connection method of the common end of the light emitting diode. The input circuit is divided into common anode and common cathode according to the wiring method The 1/0 circuits of the junction type, grouping type, and separated junction type have a common point, and each input or output point shares a common power supply. The 1/0 circuit of the grouping type is divided into several groups, and the/0 circuit of each group has a common point. The circuits between each group are separate and different power sources can be used. The separated 1/0 circuits are isolated from each other, and each/0 can use a separate power source, as shown in Figure 2-14, Therefore, the digital input module is divided into two basic signal types: DC signal input and AC signal input

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