A method and device for constructing PLC peripheral equipment equivalents based on tcl script

Abstract

The present invention discloses a TCL script based method and apparatus for creating a PLC peripheral device equivalent device. The method comprises the steps of: according to a test task of a to-be-tested PLC, selecting a PLC control instruction corresponding to the test task from a preset PLC test script library; creating a test case according to the PLC control instruction and a TCL built-in instruction; delivering the test case to a lower computer system; the lower computer system generating an excitation signal according to the test case, and sending the excitation signal to the to-be-tested PLC; and testing the to-be-tested PLC according to the excitation signal. A PLC control instruction extension library comprises: an initialization extension library command, a registration extension command, a write single / multi-channel digital quantity command, a read single / multi-channel digital quantity command, a sampling counter command and so on. According to the method and apparatus provided by the present invention, complexity of a real environment and cumbersome of test steps are simplified, thereby improving test efficiency; and fault injection is added so as to simulate possible abnormal situations, thereby improving test coverage and reliability.

Description

technical field [0001] The invention relates to the field of PLC (programmable logic controller) software testing, in particular to a method and a device for constructing a PLC peripheral equipment equivalent based on a TCL script. Background technique [0002] In the prior art, there is a lack of mature testing methods and testing tools for PLC testing. In the process of testing PLC based on the real peripheral environment, unit tester or system joint debugging test or system comprehensive test is often used. However, since the signals and stimuli required in the test process are all derived from real peripheral devices, the test environment is complex, the test efficiency is low, the test coverage is poor, and the fault injection method is lacking. [0003] In order to solve various problems existing in testing PLC based on the real peripheral environment, it is urgent to design a PLC peripheral equipment equivalent device, which is used to simulate the real peripheral en...

AI Technical Summary

Problems solved by technology

However, since the signals and stimuli required for the test process are derived from real peripheral devices, the test environment is complicated, the test efficiency is low, the test coverage is poor, and the fault injection method is lacking.

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