Eddy, I have seen a number of bots out of control due to a) speedo failing with a shorted FET driver (quite common on NCC70s) and b) due to a CPU crash - if you say watchdog in reply then think again! In both of these cases attempting to turn off the driver enable will have no effect. I still believe that a remote kill that switches off the FETs is fine in most cases but is not as good as a electro-mechanical power interrupt but far better than nothing. I will never run a heavy without a power relay circuit, if nothing else, it has saved the embarressment of a runaway bot following a Vantec crash.
Paul
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