质量流量计与DCS通讯难点详解

为了解决质量流量计现场表头指示与DCS内的485通讯数值存在误差的故障。使用MODBUS软件测试收发数据,重组通讯数据的二进制排列,发现是由浮点双字(1-2,3-4)两个区域的数据倒位和错位导致的误差,可以通过修改DCS数据的取值移位和取反来解决。在现场仪表与控制系统的通讯数据处理过程中,对浮点双字等长字节的数据类型,必须保证仪表与系统组态的收发顺序一致。

In order to remove the deviation emerged in the communicating process of mass flowmeter with DCS,the MODBUS test software is used.The deviation is produced by the invertion of the two areas of the double float data,it can be corrected by recombination of the binary arrangement.During the data deeling communication process,making sure the sequence of the double float data in the DCS configuration is the same with that in the mass flowmeter.