Digital input circuit has electrical input for detecting input direct current voltage, and output-side electrical switching contact is provided for outputting digital switching signal

摘要

The digital input circuit (1) has an electrical input (5) for detecting an input direct current voltage (UE). An output-side electrical switching contact (10) is provided for outputting the digital switching signal, if the input direct current voltage exceeds and falls below a given threshold voltage value. The series of connection are provided with a fixed voltage regulator (15), a light emitting diode of an optocoupler (8), a current-limiting element for limiting the input current of a current value and a voltage-dependent switching element.