Digital input circuit for receiving a digital input signal from a Signal Generator

Abstract

The invention relates to a digital input circuit for receiving a digital input signal. The digital input circuit comprises: a digital input circuit; a first sub-circuit, wherein the first sub-circuitis provided with a first digital input end and a first threshold element, when the first digital input signal reaches or is lower than a lower threshold value, the first sub-circuit occupies a first state, when the first digital input signal reaches or exceeds an upper threshold value, the second digital input signal is output, and the first sub-circuit occupies a second state; and at least one second sub-circuit, wherein the second sub-circuit is provided with a second digital input end and a second threshold element, when the second digital input signal reaches or is lower than the lower threshold value, the first sub-circuit assumes a first state when a first digital input signal reaches or exceeds an upper threshold value, the second sub-circuit assumes a second state when a second digital input signal reaches or exceeds an upper threshold value, and the digital input circuit has a combined test and current boosting device which is designed to generate a control signal.

Description

technical field [0001] The invention relates to a digital input circuit for receiving a digital input signal of at least one signal transmitter, said digital input circuit comprising: [0002] - a first subcircuit having a first digital input and having a first threshold element, via which a first digital input signal can be supplied to the first subcircuit, by means of The first threshold element is capable of determining a state of the first subcircuit, wherein when the first digital input signal reaches or falls below a lower threshold, the first subcircuit assumes a first state, and when the said first subcircuit assumes a second state when the first digital input signal reaches or exceeds an upper threshold, and [0003] - at least one second subcircuit having a second digital input and having a second threshold element, via which a second digital input signal can be supplied to the second subcircuit, The state of the second subcircuit can be determined by means of the ...

AI Technical Summary

Problems solved by technology

Here too, the disadvantage remains that the faults F1 to F4 cannot be detected by testing the subcircuits of the two digital inputs I1 , I2

Therefore, even in figure 2 In the digital input circuit 300 shown, dangerous situations can occur not only in single-channel but also in dual-channel operation due to the accumulation of faults

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