That depends on what you do with the enable signal to the CP motor. You can wire the enable high and they wont drop (or coast) till power is removed. But if you do that, an E-stop will stop the train of step signals sent to the motor but the motor will continue to complete the steps is has been issued.n Not exactly coasting because it will use all its power to complete the steps it has been given.

If you remove the enable signal it could probably coast but not very far. There is a lot of reluctance in these so they don't like to be pushed or to coast.