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I/Os and DST

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

gahtms0l

2 Replies

  • PRASHANT-MUTTEPAWAR
    yes both are same
  • John Rezabek
    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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