Detection system and electronic equipment supporting digital input signals of different effective levels

Abstract

The invention provides a detection system supporting digital input signals with different effective levels, comprising: when the first control module detects that the effective level is high, it receives a low level signal, and controls the first operation unit of the first input module to cut off; the detection is effective Low, receive a high level signal, control the first operation unit of the first input module to be saturated; the second control module detects valid high, receive a low level signal, control the second operation unit of the second input module to be saturated; detection is valid When it is low, it receives a high-level signal and controls the second operation unit of the second input module to be cut off; the first input module detects an effective high, receives multiple DI signals, and controls its own third operation unit to be on or off to generate The output signal for detection; when the second input module detects that it is effectively low, it receives multiple DI signals, and controls its own fourth operation unit to generate an output signal for detection when it is turned on or off. The invention supports N detection circuits and can be flexibly configured according to different requirements.

Description

technical field [0001] The invention belongs to the technical field of electronic circuits, and relates to a detection system, in particular to a detection system and electronic equipment supporting digital input signals of different effective levels. Background technique [0002] The identification circuit for digital input DI is divided into high-level identification circuit and low-level identification circuit. The high-level identification circuit intelligently identifies high-effective digital input HDI, and the low-level identification circuit can only identify low-effective numbers. Enter LDI. [0003] see figure 1 , which is shown as an effective high-level digital input signal identification circuit diagram in the prior art. Such as figure 1 As shown, when the HDI input is at a high level, the emitter junction voltage Vbe>0.7V of the triode Q42 is passed through the diode D37 and the voltage dividing resistors R294, R295 and R296, Q42 is turned on, and the signal...

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Problems solved by technology

[0005] from figure 1 and figure 2 It can be seen that the disadvantage of the prior art is that once the hardware design of the single board is completed, the number and positions of the effective high-level DI detection circuits and the effective low-level DI detection circuits are determined, and the same design can only be applied to one occasion. When the high and low level effective requirements of the digital input DI change, a single board must be rebuilt to meet the system requirements, and the number of detection circuits of the two signal types supported in the existing design is less than n

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