Gaitan Vasile-Gheorghita, Gaitan Nicoleta-Cristina, Ungurean Ioan
Stefan cel Mare University of Suceava, Universitatii Street no. 13, 720229 Suceava, Romania.
ISA Trans. 2014 May;53(3):776-86. doi: 10.1016/j.isatra.2014.02.006. Epub 2014 Mar 17.
Real time data-acquisition from fieldbuses strongly depends on the network type and protocol used. Currently, there is an impressive number of fieldbuses, some of them are completely defined and others are incompletely defined. In those from the second category, the time variable, the main element in real-time data acquisition, does not appear explicitly. Examples include protocols such as Modbus ASCII/RTU, M-bus, ASCII character-based, and so on. This paper defines a flexible acquisition cycle based on the Master-Slave architecture that can be implemented on a Master station, called a Base Station Gateway (BSG). The BSG can add a timestamp for temporal location of data. It also presents a possible extension for the Modbus protocol, developed as simple and low cost solution based on existing hardware.
从现场总线进行实时数据采集在很大程度上取决于所使用的网络类型和协议。目前，现场总线的数量众多，其中一些已被完全定义，而另一些则定义不完整。在第二类现场总线中，实时数据采集中的主要元素——时间变量并未明确出现。示例包括诸如Modbus ASCII/RTU、M-bus、基于ASCII字符等协议。本文定义了一种基于主从架构的灵活采集周期，该周期可在一个称为基站网关（BSG）的主站上实现。BSG可以为数据的时间定位添加时间戳。本文还提出了对Modbus协议的一种可能扩展，它是基于现有硬件开发的一种简单且低成本的解决方案。
