A servo control device comprises a current supply unit for supplying a drive unit with a drive current for driving a target to be controlled, a first detector for detecting at least the drive current value, and a logical arithmetic section. The systems analysis module is configured to obtain operational information corresponding to a system-wide operation of a multi-element system. A key feature of the method is that identification of which serifs will be within a critical distance from a neighbouring edge is performed by the application of a few simple logical operations. The processing system receives an instruction for a frequency output signal or a digital communication protocol signal.