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DeltaV 4-wire I/O termination block for AI

Is it advisable to connect the "+" (positive) of the 2-wire field transmitter to the +24VDC of the Bussed field power supply while the "-"(negative) to the "-" (negative) terminal of the 4-wire I/O terminal block of the AI card?

Normally, a 2-wire transmitter must use a 2-wire I/O terminal block. But what if I use a 4-wire I/O terminal block? BTW, the reason is that I have 4-wire transmitters connected to the other channels of the AI card and I don't want to replace the already existing 4-wire I/O terminal block. The 2-wire transmitter is just an additional to the card.

Rein
  • RickV

    Alec,

    Short answer no.

    If you have traditional AI card with a 4-wire term block, it can also do 2-wire transmitters.  Refer to Books On Line (BOL) for your version of DeltaV and IO type for additional information.

  • Mariappan Subramanian

    In reply to RickV:

    RickV,

    The Terminal Block mentioned applies only to S-Series (AI Card has 2 Wire and 4 Wire in a Single Card). M Series doesn't have this Terminal Block, AI Card has only 2 Wire circuitry or 4 Wire not Both in a Single Card.
  • RickV

    In reply to Mariappan Subramanian:

    If system is M-Series, then not advisable especially if HART transmitters are used. There was a KBA some years back warning that installing 2-wire and 4-wire HART devices on the same AI card could cause spikes on the input channels.
  • Rein
    RickV,
    Can you provide the KBA no.? Bec. we have tested it and it was working.
  • RickV

    In reply to Rein:

    You asked if it is advisable to connect a two wire transmitter to a 4-wire AI card and Term block. The answer is no. Will it work, in theory yes.

    KBA AUS1-131-010109103148 states “2-wire and 4-wire HART input devices should not be used on the same type VE4003 HART input card. When at least one HART Analog Input Channel with a 2-wire HART device and at least one HART Analog Input Channel with a 4-wire HART device are used on the same HART input card, spikes will be generated on the input signals.”
    Hope this helps.

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