Jump to content

Simon's Blog

  • entries
    4
  • comments
    3
  • views
    13,440

The term HART is great for bad puns


Simon

1,980 views

I was offered an unused ABB pressure transducer with HART interface (see http://www.hartcomm.org/). HART stands for Highway Addressable Remote Transducer. Showing the ability to read all values from such a device using Unitronics is an advantage for applications in the mining and resources sectors in particular.Using the Turck BL20-E-GW-EN and BL20-2AIH-I a simple ModbusTCP gateway module was possible. Whilst all HART values are accessible as Modbus registers, the conventional 4..20mA input value is stored as a 16-bit signed integer (MI) but the HART values are 32-bit Float values (MF). Also the Float registers must have the word order reveresed. I currently have a V530 program that reads all values and displays them on the screen. Using SB102 allows the word order to be reversed when reading the Floats.Two problems currently remain* The remote device does not appear to detect a lost connection, and doesn't automatically connect on power up. Not sure what is happening here, but it seems like the problem is with the remote device, as I have not had this much trouble communicating with other ModbusTCP devices from a Unitronics PLC.* converting the project to V350 mostly worked, but the reversal of the float words did not work - also not sure about that one, and haven't spent the time reading the help files for clues at this stage..

0 Comments


Recommended Comments

There are no comments to display.

Guest
Add a comment...

×   Pasted as rich text.   Paste as plain text instead

  Only 75 emoji are allowed.

×   Your link has been automatically embedded.   Display as a link instead

×   Your previous content has been restored.   Clear editor

×   You cannot paste images directly. Upload or insert images from URL.

×
×
  • Create New...