How do I clear the "INH" or "INHIBIT" message on my Commander keypad?

Make sure the Drive enable terminal ( T11) on C200 (or M100-M200) or the Safe Torque OFF inputs on the C300 (M300-M400) drive are energized with a 24VDC supply from T9 or T17, or an external 24VDC supply that shares a same common reference with the drive IO.