plc数字量和模拟量输入模块的区别是什么? -般来说我们把模拟量模块分为三种的:一是模拟量输入模块、 二是模拟星输出模块、三是模拟量输入/输出模块。那数字量输入模块跟模拟量输入模块有什么区别呢? 一: PLC模拟量输入模块(模拟量输入模块)又称A/D模块，将现场由传感器检测而产生的连续的模拟量信号转换成PLC的CPU可以接收的数字量，一般多为12位二进制数，数字量位数越多的模块,分辨率就越高。 二: PLC模拟量输出模块。模拟量输出模块又称为D/A模块，把PLC的CPU送往模拟量输出模块的数字量转换成外部设备可以接收的模拟量(电压或电流)。模拟量输出模块所接收的数字信号一般多为12位二 进制数， 数字量位数越多的模块，分辨率就越高。而数字量模块就是检测外部开关量输入的状态。 What is the difference between PLC digital and analog input modules- Generally speaking, we divide analog modules into three types: first, analog input modules, second, analog star output modules, and third, analog input/output modules. What is the difference between a digital input module and an analog input module? 1： The PLC analog input module (analog input module), also known as the A/D module, converts continuous analog signals generated by sensors on site into digital quantities that can be received by the CPU of the PLC. Generally, it is a 12 bit binary number, and the module with more digital quantity digits has higher resolution. 2： PLC analog output module. The analog output module, also known as the D/A module, converts the digital signals sent by the PLC CPU to the analog output module into analog signals (voltage or current) that can be received by external devices. The digital signal received by the analog output module is usually a 12 bit binary number, and the module with more digital digits has higher resolution. The digital module is used to detect the status of external switch inputs.
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