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Process control station analog input change rate protection implementation method

A technology of process control station and change rate, which is applied in the direction of program control, general control system, control/regulation system, etc., to achieve reasonable and accurate calculation methods and reliable results

Active Publication Date: 2022-06-10
NANJING GUODIAN NANZI WEIMEIDE AUTOMATION CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The current problem is that the acquisition period of the analog card is often greater than the calculation period of the controller logic, resulting in a large deviation in the calculated analog signal change rate

Method used

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  • Process control station analog input change rate protection implementation method
  • Process control station analog input change rate protection implementation method
  • Process control station analog input change rate protection implementation method

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0038] There is a communication bus between the CPU and the analog input card and the output card.

[0039] The analog input module, rate protection module, and output module running in the CPU all run in cycles, and the cycles are configurable.

[0040] The in-situ signal data of the analog input card is also collected periodically, and the collection cycle is often greater than the operating cycle of the module in the CPU.

[0041] The analog input module in the CPU acquires the data collected by the analog input card in a cycle. When the single-channel acquisition period (P2) of the analog input card is longer than the operation period (P1) of the analog input module in the CPU, that is, P2 >P1, the analog input module in the CPU gets the same data multiple times within the time of P2.

[0042] The single-channel acquisition period of the analog input card is P2, and the values ​​of two adjacent acquisitions are X1 and X2 respectively, then the actual input change rate wit...

Embodiment 2

[0049] The input rate of change is recalculated each time the A / D module provides data. The calculation process is implemented in the algorithm module. Then the input change rate and channel value are transmitted to the host computer through the communication module.

[0050] Example 3:

[0051] The invention focuses on solving the influence of inconsistency between collection and calculation cycles. The rate of change of the input can be calculated in the controller with an optimization algorithm. It is also possible to calculate both the input change rate logic calculation and data acquisition in the analog input card.

[0052] The above is only a preferred embodiment of the present invention, it should be pointed out that for those of ordinary skill in the art, without departing from the principle of the present invention, some improvements and modifications can also be made, and these improvements and modifications are also possible. It should be regarded as the protec...

Embodiment 3

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PUM

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Abstract

The invention discloses a process control station analog input change rate protection implementation method, which comprises the following steps of: setting a time span greater than an analog card channel acquisition period, and acquiring data by using an array storage channel; and calculating the ratio of the analog quantity acquisition period to the calculation period in the controller. The length of the array is an integer and is an integer-up ratio. New data obtained by each analog input is put into the array, the array assigns the previous number to the next number, and the calculated input change rate is the difference / time span of data at two ends of the array. And the calculated input change rate is used for subsequent rate protection logic. The method disclosed by the invention is more reasonable and accurate, and is not influenced by inconsistency of an input change rate logic calculation period and a single-channel acquisition period in the controller, so that the analog input change rate protection logic is more reliably realized.

Description

technical field [0001] The invention relates to a process control station analog input change rate protection realization method, which belongs to the technical field of industrial DCS automatic control. Background technique [0002] In the industrial production process, in order to prevent the occurrence of misoperation due to the failure of the detection signal circuit, it is often necessary to detect specific key analog signals. For example, in DCS (Distributed Control System, that is, distributed control system), the moment the thermal resistance and thermocouple signals are disconnected, it may cause a false increase in the displayed temperature, and sometimes even exceed the alarm value of the equipment, thereby causing equipment errors. action. In order to solve this kind of problem, DCS sets up the signal rate protection logic to detect the key analog signal. When the change rate of the key analog signal exceeds the set value, it is judged as signal abnormality. ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G05B23/02
CPCG05B23/0213G05B2219/24065Y02P90/02
Inventor 张明惠吴胜华周建玉许天骄吴科
Owner NANJING GUODIAN NANZI WEIMEIDE AUTOMATION CO LTD