LDGRB 01BSE013177R1 将数字输入和继电器输出结合

模拟量信号，有2种，电压或者电流信号 ，一般是变送器传过来的信号，比如用压力变送器检测水管压力，它会输出一个模拟信号4--20ma 或者 0-10V的信号给PLC，PLC来进行数据处理。

开关量输入点(DI),处理开关量输入信号.

模拟量输入点(AI),处理模拟量输入信号(0-20mADC,0-5VDC).

电阻信号(含热电阻)输入点,处理热电阻或一般电阻信号.

高速脉冲输入点,处理高速脉冲信号.

电压(含热电偶)输入点,处理电压输入或热电偶信号.

还有通讯,用于和上位机交换数据或控制下级控制器仪表驱动器等

根据现场输入信号的不同，可将输入模块分为开关量输入模块和模拟量输入模块。

开关量输入模块的作用是把各种开关信号变成CPU所需的TTL标准信号。按输入端电源类型，又可将其为直流输入模块和交流输入模块。输入信号经分压、限流、滤波后再通过光电耦合转换成TTL（5V）标准信号。

模拟量输入模块的作用是把现场连续变化的模拟量信号如温度、流量、电流、电压等转换成CPU能够处理的若干位数字信号。模拟量输入电路一般由运放变换、模转换（A/D）、光电隔离等组成。

PLC输入、输出模块的种类：数字输入DI,数字输出DO,模拟量输入AI，模拟量输出AO。

数字的输入输出一般都是24V的.

LDGRB 01BSE013177R1 将数字输入和继电器输出结合

Analog signals, there are two, voltage or current signals, generally the signal transmitted by the transmitter, such as the pressure transmitter to detect the pressure of the water pipe, it will output an analog signal 4-20mA or 0-10V signal to the PLC, PLC for data processing.

The switching input point (DI) processes the switching input signal.

Analog input point (AI), processing analog input signals (0-20mADC,0-5VDC).

Resistance signal (including thermal resistance) input point, processing thermal resistance or general resistance signal.

High-speed pulse input point, processing high-speed pulse signal.

Voltage (including thermocouple) input point, processing voltage input or thermocouple signal.

There is also communication, which is used to exchange data with the upper computer or control the instrument driver of the lower controller

According to the difference of field input signal, the input module can be divided into switching input module and analog input module.

The function of the switching input module is to convert various switching signals into TTL standard signals required by the CPU. According to the input power supply type, it can be divided into DC input module and AC input module. The input signal is converted into TTL (5V) standard signal by photoelectric coupling after voltage division, current limiting and filtering.

The function of the analog input module is to convert the continuously changing analog signals such as temperature, flow, current, voltage, etc. into several digital signals that the CPU can process. The analog input circuit is generally composed of op amp conversion, mode conversion (A/D), photoelectric isolation, etc.

Types of PLC input and output modules: digital input DI, digital output DO, analog input AI, analog output AO.

Digital input and output are generally 24V.