I'm attempting to design a PoE PD for fairly high-power applications; chiefly, powering/driving stepper motors. Currently, both motors and drivers run at 24V and will consume about 30W per PD. At that kind of power, regulation gets a little expensive, particularly when wanting isolated regulation.
My question is: if I do something like the below (which is heavily simplified), replacing the motor drivers (I think the motors can handle the higher voltage already) with higher-powered versions and tapping off the unregulated PoE voltage, will I be violating any important standard, safety or otherwise, that would present a hazard or cause problems if I wanted to get the device certified for commercial sale? Note the Tx/Rx pairs are device-side and already isolated, everything network-side is just the one line on the left.