Once you have all the components for your ControlLogix rack, you will need to attach the 1756-PA75 power supply to the 1756-A4 rack. The 1756-PA75 slides right on to the left side of the 1756-A4 rack and can be tightened using the two black screws found inside the swing door of the 1756-PA75 power supply.
The I/O cards will slide and click into place easily. You should mount the cards in the positions referenced in the following table:
| Card | Slot Number |
| 1756-L55/A ControlLogix processor (CPU) | 0 |
| 1756-ENBT/A ControlLogix EtherNet/IP module | 1 |
| 1756-OB16E ControlLogix digital output module | 2 |
| 1756-IB16 ControlLogix digital input... |
