Install the I/O cards on the carrier

The I/O cards install in the slots labeled 1, 2, 3, and 4 on the carrier. Each slot has four keys labeled A, B, C, and D that are used to configure the slot to allow only a specific card type to be installed.

In hazardous locations the I/O cards should not be removed or inserted into the carrier unless the input power has been de-energized for at least one minute.
Figure: Card slot and key on the carrier


  1. Locate the slot into which you want to install the I/O card.
  2. Break off the appropriate keys with a screwdriver.
    Table: Keying assignments
    Card Carrier keys to be removed
    Zone 1 Discrete I/O B and D
    Zone 1 Analog I/O A and C
    Note

    A key replacement kit is included with each carrier to reconfigure the slots.

  3. Align the connectors on the back of the I/O card with the connectors on the carrier and push to attach the I/O card to the carrier.
  4. Tighten the two mounting screws on the card with a 3 mm hex-head wrench.