A redundant controller system requires an additional two-wide carrier to support the additional controller and power supply. The following figure shows a redundant controller installation.
Refer to the preceding image:
- Controller 1 receives 5V and 3.3V power from power supply 1.
- Controller 2 receives 5V and 3.3V power from power supply 2.
- Both power supplies provide 12V, load sharing power to the I/O cards.
For redundant I/O power, ensure that there is enough power for the active controller and I/O if one power supply fails. If the two power supplies are not capable of providing redundant power to the controllers and I/O cards, you can install an additional carrier and power supplies to the left of the controller carrier.