SIEMENS 1FK7101-5AF71-1DGO是SIMATIC S7-400系列中央处理器的一种，通常用于自动化和控制应用。具体来说，这款中央处理器是可编程逻辑控制器（PLC）的主要组件，通常用于自动化和控制应用中。其设计思路是先产生一个分辨率为0.02mV、动态范围为0～2.5V的标准电压信号Vstand，然后通过放大电路将该基本电压放大5倍，就可以得到0～12.5V、分辨率为0.1mV的直流电压，从而实现高精度的电压源。而动态范围为0～20mA、分辨率为0.001mA的高精度电流源则是通过将Vstand接到场效应管上实现的。

It is a type of SIMATIC S7-400 series central processing unit commonly used in automation and control applications. Specifically, this central processing unit is the main component of a programmable logic controller (PLC), typically used in automation and control applications. The design idea is to first generate a standard voltage signal Vstand with a resolution of 0.02mV and a dynamic range of 0-2.5V, and then amplify the basic voltage by 5 times through an amplification circuit to obtain a DC voltage of 0-12.5V and a resolution of 0.1mV, thereby achieving a high-precision voltage source. A high-precision current source with a dynamic range of 0-20mA and a resolution of 0.001mA is achieved by connecting a Vstand to a field-effect transistor.