Port fault detection circuit

Abstract

The invention provides a port fault detection circuit. The port fault detection circuit comprises at least one repeater circuit and a processor. The at least one repeater circuit is connected with an output circuit of a port to be detected and an input circuit of the port to be detected and / or an output circuit of another port to be detected and an input circuit of the port to be detected. The processor is used for comparing a first signal acquired from the input circuit of the port to be detected with a first threshold, when the difference between the first signal and the first threshold is larger than a second threshold, it is determined that the port to be detected is faulty, wherein the first signal is a signal received by the repeater circuit from the output circuit of the port to be detected and passing through the input circuit of the port to be detected or is a signal received by the repeater circuit from another port to be detected and passing through the input circuit of the port to be detected. According to the invention, problems that the port detection cost is too high, and the detection efficiency is relatively low are solved; when the port is detected, external extra loads are not needed; by means of the connected repeater circuit, the fault port and the fault circuit can be positioned quickly.

Description

technical field [0001] The invention relates to the field of port detection, in particular to a port fault detection circuit. Background technique [0002] The general digital control system has comprehensive and rich port types, and some ports also integrate input functions or output functions at the same time, and each function also has multiple working modes. [0003] So many ports and modes make test verification and fault detection difficult, the test methods in the prior art, such as figure 1 As shown, the port function of the general digital control system cannot be quickly tested, and the external load needs to be replaced every time a mode is changed. A large number of ports and modes have higher requirements on the number and specifications of the load. Under the condition of ensuring a comprehensive test, manual replacement of loads becomes time-consuming and labor-intensive, which makes fault detection inefficient, especially in production detection and after-sa...

AI Technical Summary

Problems solved by technology

[0004] In view of this, the embodiment of the present invention provides a port fault detection circuit to solve the problem of high cost and low efficiency of port detection in the prior art

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