Q about M17 and M18 commands

[mrehorstdmd]

I intend to run some tests on my printer to check the movement of the Z axis when the power is cut and then resumed to get some idea of whether prints could be resumed after a power failure.

Can I expect the motors to behave the same if I cycle the 24V to the duet board or just use M18/M17 to cycle motor power?

[Phaedrux]

Yes I believe so. Either way they are deenergized.

[mrehorstdmd]

@phaedrux Great! Thanks!

[dc42]

@mrehorstdmd one difference is that when you cycle the power, the motors start up at microstep position zero. So even if the Z axis has no tendency to drop, it will move by up to +/- 2 full steps. When you turn motors off/on using M18/M17 they retain their previous microstep position.

[mrehorstdmd]

@dc42 Thanks, that's the thing I want to test, so I will interrupt the 24V supply instead of using M17/M18.