Understanding Z-Probing

I'm trying to understand how the Z-probing works and am confused about some terminology. I've made a little diagram of a probing setup at the moment the z-probe triggers. 
In this image from what I understand, A is the Z-probe Height but I don't know what B would be called in your firmware or if it's relevant. The big one I don't understand is Max. z-probe - bed dist. Would you be able to mark on this diagram where Max. z-probe - bed dist. is?


  • Yes A is z probe height when B is the distance where it triggers. B it self is not relevant and no where entered.

    Max. z-probe - bed dist is maybe not the best name. It is just when you homed already so Z is known and you are higher the that distance when you call G32 or G33 it will go down to that distance to speed up measurement. When you start lower it will use that height instead (except on deltas where it will always home).
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