Analysis of Methods for Rate of Change Protection of Analog Input Signals
In Distributed Control Systems(DCS),abrupt changes in analog input signals can potentially trigger misoperations,highlighting the crucial importance of monitoring the rate of change(ROC)for critical analog input signals.However,the acquisition cycle of analog input modules often exceeds the logical calculation cycle of controllers,leading to significant deviations in the calculated ROC of analog input signals.This article proposes two methods to address this issue:firstly,employing an optimization algorithm within the Control Processing Unit(CPU)to calculate the ROC of inputs;secondly,performing ROC calculation and data acquisition within the analog input module,subsequently uploading the results to the CPU.Both approaches effectively enhance the accuracy of rate protection logic,overcoming the inconsistency between the acquisition cycle and calculation cycle,thereby significantly improving the reliability of ROC protection for analog input signals.
analog input signalrate of change protectionsignal acquisitionlogical calculation cycleoptimization algorithm
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