摘要
在开发的基于PLC的船舶驾驶台航行值班报警系统(BNWAS)中,用4位数码管进行参数显示。由于LED数目多,占用PLC输出点数多,成本高。为了降低成本,设计了一种译码输出电路,在PLC输出端与数码管显示器之间增加少量的硬件电子电路,配合软件编程,仅用PLC的7个输出点就可控制4位数码管的27段LED,并且解决了由于各位数码管分时输出所产生的显示不稳定问题。
LED display of 4 numbers is used to display system （BNWAS） which is developed based on PLC. It the parameters in bridge navigational watch alarm is high cost because of occupying too many output points by LEDs. In order to reduce the cost, a decoding output circuit is designed. Only 7 output points of PLC can be used to control 28 LEDs of 4 numbers by increasing a few electronic circuits between outputs of PLC and LEDs and combined with programming, the trouble of unstable display caused by dynamical output is resolved.
出处
《船电技术》
2014年第3期5-7,11,共4页
Marine Electric & Electronic Engineering
