Rockwell Automation 20P PowerFlex DC Drive Analog and Digital I/O Expansion Circuit Board - Manual (Page 7)

PowerFlex® DC Drive Analog and Digital I/O Expansion Circuit Board 7
3. Carefully insert the connector pins on the back of the I/O Expansion
board into connector XBB on the Control board and push the board
down until it makes contact with the stand-offs.
Important: Push the board straight down so that the pins on the I/O
Expansion board do not bend or break.
4. Secure the I/O Expansion board to the stand-offs on the Control board
using the two screws provided.
Important: Do not over tighten the screws or circuit board damage may
occur.
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Insert pins into connector XBB
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Install two screws