I/Os and DST

IS I/O the same as DST? DST= Device Signal Tags

gahtms0l

• 30 May 2018 8:38 AM
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2 Replies

• PRASHANT-MUTTEPAWAR

  

  • 30 May 2018 1:23 PM

  yes both are same

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• John Rezabek

  

  • 30 May 2018 2:46 PM

  Broadly speaking they are connected. A few nuances . . .
  1) 100 "SCADA" points coming in over serial modbus will consume 1 DST for the Dataset.
  2) Fieldbus I/O consume 1 DST per device no matter how many I/O are configured, so e.g. a coriolis meter might have mass flow, volume flow, and density and temperature all configured but you will use only one DST. Discrete I/O for on-off valves - same thing.
  3) The same is true for wired HART. WirelessHART I believe works the same as well.
  4) As best I know conventional and remote IO consume 1 DST per input / output so for that case IO count = DST count (although all DST's are not equal, last I checked).
  
  Hope this helps . . .

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