Axis Loss Detection (Gecko)

[bill south]

To all of those folks more knowledgable than I am with control circuits (99% maybe) I have a question. Forgive me if this has been address before (as I'm sure it has)!!! My concern is, if during a run a gecko faults, the corresponding servo stops. In my simple control circuit, the other axis will continue working at least for a while (I think ). Well, the part most likely will be ruinded before the entire system crashes and stops.
Is there a circuit available which will monitor each axis and shut down all geckos if one faults? One from a vendor would be most helpful but I can build one if a schematic is available.
Is this a legitimate concern?
If someone has seen this in a thread before, please let me know the key words to search on.
As ususal, thanks in advance.
billyjack

[ger21]

http://www.rogersmachine.net/encoderinterface.html