Adjustment method of real-time data time label, upper computer and distributed control system

Abstract

The application provides an adjusting method of a real-time data time label, a host computer and a dispersion control system. The host computer is used for receiving real-time data and a time label of the real-time data submitted by a secondary computer, for calculating a theoretic time label of the real-time data, and for calculating the absolute value of difference between the theoretic time label of the real-time data and the time label of the real-time data submitted by the secondary computer; when the absolute value of difference is less than a preset value, the theoretic time label of the real-time data is taken as the practical time label of the real-time data; a time label for drawing a tendency chart is calculated according to the requirement on precision of a clock period on the basis of the practical time label of the real-time data. The adjusting method of the real-time data time label, the host computer and the dispersion control system provided by the application can be used for drawing the tendency chart under the situation that the impact deviation on the time label of network load, CPU (Central Processing Unit) load, inaccuracy in timing period, clock synchronization of small amplitude and the like is in a preset range.

Description

technical field [0001] The invention relates to the technical field of industrial control, in particular to a real-time data time label adjustment method, a host computer and a distributed control system. Background technique [0002] In the industrial control airspace, the distributed control system (DCS, Distributed Control Systems) is divided into upper computer and lower computer, wherein, the upper computer is the operator station, and the lower computer is the control station. [0003] Normally, the lower computer sends VQT data to the upper computer with a basic cycle of 1 second, where V (Value) in VQT represents the value of the data, Q (Quality) represents the quality code of the data, and T (TimeStamp) represents the data generation time. Under normal circumstances, the data received by the HMI software has a fixed cycle, which is usually 1 second. However, in reality, the accuracy of the timing cycle of the lower computer will be affected by the CPU load and net...

AI Technical Summary

Problems solved by technology

[0005] In view of this, the present invention provides a real-time data time label adjustment method, a host computer and a distributed control system, which are used to solve the trend graph drawn by the host computer due to the inaccuracy of the time label sent by the lower computer in the prior art. For problems such as flattening, disconnection, and trend curve shifting, the technical solution is as follows:

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