How to measure CompactRIO system input voltage

Hello,
I would like to measure the voltage of the two 9-35V DC inputs going to the CompactRIO RT controller. I am using the 4-slot chassis due to space considerations and do not have a 24V analog input module on-board to be able to do this via a module. On the 9205 analog input module there is a hook for "chassis temperature" that works perfectly. I am trying to find a similar hook to read the voltage that the CompactRIO is running on.
I will be running this CompactRIO on two 24V batteries and wanted to be able to detect when the battery levels were too low to continue operation. When this state is reached, or hopefully prior to, I want to offload the data I have collected before running out of power to do so.
Any ideas?
Thanks,
Ryan
Senior Systems Manager, CIMIT
Massachusetts General Hospital
Cambridge, MA
www.cimit.org

Hi Eric,
I am not an electrical engineer, so trying to figure out a clever way to split the voltage and measure it on three different inputs would be a job for one of the other researchers here. This seems like a straightforward feature though. We are using the CompactRIO as an onboard controller for a robot, but I would imagine that other more "mission-critical" applications would benefit from knowing the voltage that is powering the C-RIO. Much like the on-board chassis temperature reading, it seems like an important piece that is missing from the basic feature list. I don't know if we even have the 3 inputs free on the AI module as they are used to control everything else.
Hmm.
Thanks,
Ryan
Senior Systems Manager, CIMIT
Massachusetts General Hospital
Cambridge, MA
www.cimit.org

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