提高数字量输入信号采集回路安全性的方法分析  

Analysis of Processing Methods to Improve the Security of Digital Input Signal Acquisition Loop

作　　者：许天骄 吴胜华 张楠桢 马伟东 Xu Tianjiao;Wu Shenghua;Zhang Nanzhen;Ma Weidong(Nanjing SAC Valmet Automation Co.,Ltd.,Nanjing,210032,China)

机构地区：[1]南京国电南自维美德自动化有限公司,南京210032

出　　处：《仪器仪表用户》2021年第8期26-28,共3页Instrumentation

摘　　要：数字量输入信号在工业自动控制现场十分常见,主要表现为阀门的反馈、运动设备的到位情况、安防信号等。在采集的过程中,其通道中可能窜入各种干扰或者存在人为的接线错误等,这就会导致数字量信号采集不准确,严重的更会导致数字量输入回路一些器件的损坏。本文就如何提高数字量输入信号采集回路的安全性进行了详细的分析,提出了一种方法,不仅能够提高数字量输入通道的抗干扰能力,而且可以实现对输入回路器件的过流保护。Digital input signal is very common in the industrial automatic control field,mainly manifested in valve feedback,the position of motion equipment,security signal,etc.In the process of acquisition,the channel may be jammed in various ways or there are artificial wiring errors,which will lead to inaccurate acquisition of digital signal,and serious damage to some devices in digital input circuit.This paper analyzes how to improve the safety of digital input signal acquisition circuit in detail.A method is proposed,which can not only improve the anti-interference ability of digital input channel,but also realize the over-current protection of input circuit devices.

关 键 词：分散控制系统 数字量输入信号 安全性 DI 

分 类 号：TP274.2[自动化与计算机技术—检测技术与自动化装置]