Device for testing response time of SCADA (Supervisory Control And Data Acquisition) system

Abstract

The invention discloses a device for testing response time of a SCADA (Supervisory Control And Data Acquisition) system, which comprises a first unit, a first acquisition end (A), a second acquisitionend (B) and a human-computer interface, wherein the first unit is used for injecting an excitation signal into a RTU (Remote Terminal Unit) of the SCADA system; the first acquisition end (A) is usedfor acquiring an output signal of the first unit or acquiring an image response event, a mouse click event, a keyboard click event and a screen touch event of the SCADA system; the second acquisitionend (B) is used for acquiring an output signal of the RTU of the SCADA system or acquiring the image response event, the mouse click event, the keyboard click event and the screen touch event of the SCADA system; the human-computer interface is used for controlling the first unit to send the excitation signal to the SCADA system, controlling the first acquisition end (A) and the second acquisitionend (B) to acquire signal waveforms, displaying the signal waveforms on a display, automatically acquiring rising edge or falling edge time of signals received by the first acquisition end (A) and the second acquisition end (B), calculating response time values and recording and storing a testing result. The device disclosed by the invention is used for replacing a conventional mode of using an oscilloscope for carrying out measurement analysis, so that testing efficiency can be effectively improved, and economy and flexibility are promoted.

Description

technical field [0001] The invention relates to a SCADA (Supervisory Control And Data Acquisition) system, that is, a product testing verification method and testing equipment of a data acquisition and monitoring control system. Background technique [0002] For a SCADA system, its response time indicators usually include: [0003] ●Response time of automatic control. That is, the sensor signal is collected from the input module of the RTU unit controller of SCADA, after the internal calculation of the controller, and then the on / off command of the output device is output through the output module, the overall response time of this series of paths. [0004] ●Response time of manual control. That is, the overall response time of this series of paths from when the operator operates on the SCADA HMI workstation through the mouse or keyboard, the control command is transmitted to the controller of the RTU unit through communication, and then the on / off command of the output de...

AI Technical Summary

Problems solved by technology

The more channels involved in the test, the more obvious the increase in the cost of using the signal source and oscilloscope

[0011] Second, the large error

For the test method that needs to use camera video recording, since the frame where the input event and output event are located is judged by human eyes, the error of human operation is relatively large

At the same time, high-speed cameras are generally less than 240 frames per second, that is, the system error is 1000 / 240 = 4.17 milliseconds, and the higher the number of frames, the worse the picture clarity, and the greater the error of human judgment

[0012] Again, testing is inefficient and inflexible

Since traditional testing methods require the use of multiple testing instruments and equipment, all of which are manually operated, the testing process cannot be controlled uniformly, but automatic or even automated testing cannot be achieved.

Since the controller of the SCADA system is usually designed with a fixed operating cycle, the overall response time of the system is usually not a fixed value, and its time value distribution is a random process, especially in the product development stage in order to obtain enough test data. It is often necessary to repeat the test many times, and the disadvantages of low efficiency using traditional testing methods are more obvious

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