the busanschalteinheit (in a zweileiter - stromschleife and transmitters, stellungsregler and analog in - and ausgabebaugruppe with such busanschalteinheit

摘要

The unit (1) has a transformer (3) with primary windings (31, 32) interconnected such that magnetic fields produced in the transformer by a two-wire current loop (2) are mutually reduced. A low pass filter (6) i.e. inductor, and/or a high pass filter for alternating current signal is connected upstream to one of the windings. The transformer is provided for potential-free decoupling and coupling of the current signal with digital reception and transmission data. The unit performs data transmission based on protocol of highway addressable remote transducer-standards. Independent claims are also included for the following: (1) a measuring transducer comprising a bus switching unit and a measuring value input (2) a position regulator comprising a bus switching unit and a reference value output (3) an analog input assembly comprising a bus switching unit and a current measuring- and power supply unit (4) an analog output assembly comprising a bus switching unit and a current source.