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PLC输入输出模块是PLC与工业现场设备之间的核心连接桥梁，负责完成信号的双向转换与传输，是自动化控制系统里的关键组成部分。

一、核心作用

二、主流分类

按照信号类型和功能，可分为四大基础类别：

1. ‌数字量输入模块‌：接收开关通断类的二进制信号，常见支持24V DC或220V AC输入，适配按钮、行程开关等设备。

2. ‌数字量输出模块‌：分为继电器型、晶体管型、晶闸管型三类：

3. 继电器型：可驱动250V/2A交流负载，适合接触器、电磁阀等设备，机械寿命约10万次。

4. 晶体管型：响应速度可达0.1毫秒级，仅支持30V以下直流负载，适配高频脉冲控制场景。

5. 晶闸管型：专为220V交流负载设计，无火花通断，适合加热管、交流电机控制。

6. ‌模拟量输入模块‌：采集温度、压力等连续变化的物理量，支持4-20mA、0-10V、热电阻、热电偶等信号格式。

7. ‌模拟量输出模块‌：输出连续的电压/电流信号，用于控制变频器、比例调节阀等需要无级调节的设备。

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