Add a block transfer

Block transfer data is made up of an array of words that is updated only when requested by the PLC ladder logic. Block transfers allow the movement of larger amounts of data, but the data movement is generally slower than discrete data. Block transfers cannot be assigned to Listen Only racks.
To add a block transfer to your remote I/O scanner
  1. From the
    RIO Configuration
     editor, right-click the scanner and then click
    Add Block Transfer
    .
  2. In the
    Block Transfer Properties
     dialog box, choose the
    BT#
    . The available numbers depend upon the selected scanner. Select one of the rack numbers assigned to the terminal. A small portion of this rack's discrete I/O (the MCB) is reserved for block transfer.
    TIP:
    Do not assign a block transfer MCB to a Listen Only rack, because the 1784-PKTX card supports Listen Only discrete I/O, but cannot support Listen Only block transfers.
  3. Under
    Module Address
    , select the appropriate
    Rack
     and
    Group/Slot
     number.
    1. Select the
      Rack #
       assigned to the terminal. A small portion of this rack's discrete I/O (the MCB) will be reserved for the block transfer.
    2. Select the
      Group
       and
      Slot
       (LSB or MSB of word) that will be used for the MCB. Do not enter the same group/slot for more than one block transfer assignment. Note that an underscore is provided as a placeholder for the slot number.
  4. Under
    Type
    , select
    Read
     to move data from the terminal to the PLC or
    Write
     to move data from the PLC to the terminal.
  5. Select a
    Size
     to define the number of words (1-64) that the block transfer moves.
  6. When you are finished specifying the block transfer, click
    OK
     to close the
    Block Transfer Properties
     dialog box.
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