说明：  本文件为ORCAD做的原理图，是通用的模拟量输入检测电路板，该原理图的电路采用24V直流供电，采集模拟量的范围0-24V，或者是4-20mA的电流量，具有输入保护，电压隔离，电压比较等有点，并且具有AGC偏出输出+10V和-10V的偏差信号输出。
(This document is the schematic diagram of ORCAD, is the analog general input detection circuit board, the circuit principle diagram by 24V DC power supply, analog acquisition range of 0-24V, or the amount of current 4-20mA, with input voltage protection, isolation, comparison voltage point, and has a AGC offset deviation signal output the output of+10V and-10V.)