Control for mounted, towed or semi-mounted agricultural machines, as ausechselbare equipment in conjunction with tractors

Method and apparatus for operating a controller. Tractor coupled to at least a replaceable equipment, which together effect an agricultural working machine, wherein the tractor working hydraulics with at least one controller, designed as a control block with at least two directional control valves, having the interchangeable equipment via at least one hydraulic power take-off point with the operating hydraulics of the tractor coupled and wherein the interchangeable equipment comprising a controller as a microprocessor controlled job computer, which is connected to an operating unit operated remotely from the cab of the tractor out, wherein the control commands for controlling the removable equipment from either the operating unit or from the control block can be output, which acting on actuators and / or drive units and / or actuators of the removable equipment, said both control systems (4, 15) formed of the working hydraulics, as a control block (4) with wenigst ens two valve discs (31, 32), and the job computer controller (15) with at least one device-side job calculator (18, 18 ') are operable in parallel to each other, said both control systems (4, 15) by control technology interconnected and are actively connected in parallel.