Emerson Exchange 365

First, M-series is not a legacy product. It is fully supported and actively sold, with new IO cards and Controller hardware introduced in v12 and v13. Just sayin'.

The System Power supplies provide 12 V power for the IO cards and 5 volt power for the associated controller. If the IO power requirements exceed the capacity of a single System Power supply, you could lose power to the IO by pulling one of two supplies. Proper design of the IO subsystem should identify this and it can be remedied by adding a third power supply or by injecting 12 VDC power in the IO subsystem appropriately, as discussed in BOL.

Assuming your IO power requirements do not exceed one System Power supply, you can pull one without affecting the IO.

Redundant controllers each have one power supply installed on the same 2 wide supply, and each power supply in this arrangement powers its associated controller that shares the back plane. Pulling a controller powers down that controller.

A Simplex controller can have redundant System power supplies by installing a second 2-wide backplane to the left of the controller carries, and installing a second Power supply in the right hand slot. This arrangement allows both power supplies to provide 5 volt power to the controller in the left hand carrier. Again, if the IO power requirements do not exceed the single System Power supply max current, you can pull either supply and the simplex controller will continue to run, along with the IO.

If you have a redundant controller pair, you can add a third 2-wide carrier and install a third Power supply to increase IO power, making sure you are not exceeding the IO carrier max power capacity. If you install this third supply in the right hand slot, it will provide redundant 5 volt power to the left hand controller. The right hand controller will remain with simplex 5 volt power from its system power supply.

If you're not sure what your IO power requirements are, you'll need to do the calculations found in the BOL worksheet, based on your IO card types.

Andre Dicaire