摘要
本文介绍了上位机PC的串口通讯原理,同时给出了SIEMENSPLC的自由网络通信协议,提出了上下位机的软件设计方案,实现了PC通过PLC对工业现场数据的实时采集。实践证明整个系统运行稳定,采集数据及时准确。
This article introduced the string mouth （：ommunication theory of pc, both free intemet communications protocol of SIEMENS PLC, proposed the software design scheme of upper and lower machine, realized industry, field real-time data acquisition of the pc through the ple. Practice has proved the system run stably and acquisition data is timely and accurate.
出处
《价值工程》
2010年第26期155-156,共2页
Value Engineering
