摘要：随着社会主义市场经济的繁荣和发展，各大中小城市都在进行亮化工程。各企业为宣传自己企业的形象和产品，常用霓虹灯广告来实现这一目的。霓虹灯的亮灭、闪烁时间及流动方向等均可以通过PLC来进行控制。使用PLC控制霓虹灯，具有使用方便、运行可靠、控制程序设计简单等优点。

关键字：PLC；霓虹灯；梯形图程序

Abstract: With the socialist market economy increasing prosperity and development, almost every city is in bright project. The enterprises publicize their image and product, they usually use neon advertising screen to achieve this goal. The neon light’s flash and destroyed time, flow direction can be controlled by PLC. It has convenient usage and reliable running, the control program is also simple.

Key words: PLC; Neon; ladder diagram program

采用PLC来控制霓虹灯，提高了系统运行的可靠性，其梯形图程序简单直观，利用PLC的定时功能，计数功能，步进功能，可灵活地编写，增减和修改程序。PLC具有很强的自诊断功能，迅速方便的检查判断出故障，缩减检修时间，不需要很多配套的外围设备和大量复杂的接线，大大缩减了设计和施工的周期。