A method of operating a service unit and service unit

A method of operating a service unit (5A, 5B, 6A, 6B) and a service unit at a textile machine (1) having a plurality of work stations (2), wherein the service unit (5A, 5B, 6A, 6B) along the work stations (2) the procedure and operation of a workstation (2) is positioned in front of the same, wherein the working point (2) requests the service unit (5A, 5B, 6A, 6B) if necessary and the service unit (5A, 5B, 6A, 6B) on the requirement in the direction the requesting work site (2) runs and accurately with the attainment of the operating position prior to the requesting job comes to a stop (2), wherein at least one position (14, 19) within the textile machine (1) as a reference position of the service unit (5A, 5B, 6A , 6B) is detected, 6B) independently determines the service unit (5A, 5B, 6A, the distance traveled by him way (depending on the traveling speed of the service unit 5A, 5B, 6A, 6B) is a distance from the control position of the requesting a rbeitsstelle (2) in which the shutdown is initiated and it is determined from the reference position and the distance traveled when this distance has been reached is determined.