The present invention relates to controlling vacuum parameters relating to a vacuum pump arrangement in a automatic milking system, said automatic milking system comprising a vacuum pump arrangement (101), said automatic milking system comprises a milking system controller (105) arranged to control milking system parameters and said vacuum pump arrangement comprises a vacuum system controller (103) for controlling vacuum system parameters. Communication means (106) is coupled to said vacuum system controller and to said milking system controller for establishing communication between said vacuum system controllers and said milking system controller. Said milking system controller comprises signal transmitting means (108) for transmitting a message to said vacuum system controller. Said vacuum system controller comprises signal receiving means (107) for receiving said message from said milking system controller, and said vacuum system controller is arranged to change a least one of said vacuum system parameters depending on said received message.