Issues with the 485 communication of the mass flow meter
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This post was last edited by zhaojingjz on 2015-10-14 06:43. There is a Rosemount mass flow meter at the field site, and an Yokogawa CS3000 DCS inside the building; the cumulative mass flow rate from the mass flow meter is currently being read into the DCS via 485 communication. However, the readings shown by the DCS and those from the field instrument do not match – for example, the reading inside the building is 32000 while it might be 32210 at the field site. Please advise
This estimate is due to incorrect setting of your parameters – specifically, which data register is used in the 485 communication. This is a fixed parameter on the instrument, usually specified at the time of manufacturing.
What is this method of inconsistency? Is the difference significant? Do the two characters need to be reversed?
Should the communication at the site be in 32-bit or 64-bit floating point format? Sometimes, different manufacturers have different definitions for the least significant bit and the most significant bit.
For example, it’s 32,000 indoors, but it might be 32,210 on-site