Foxboro SY-0399131RC/SY-1028045RA Module

High Quality Foxboro SY-0399131RC/SY-1028045RA Module New In Stock

Introduction

Two independent measurements of the same processvariable are monitored from separate field devices. Whenboth transmitters are functioning properly, the Average ofthe two is used as the resultant controlling signal.Upon excessive deviation between the two measurements,or the failure of either one, control actions are prevented(blocked), and an operator alarm generated. In the eventof a deviation, the operator may then select one of thetwo based on other plant corroborating data as the “morecorrect” signal by bypassing the offender. Automatic controlcan resume and maintenance can be performed on the bypassed signal without loss of runtime.Dual Transmitter Algorithms have been used for feedwater controls such as Feedwater Pumprecirculation flows.

Two independent measurements of thesame process variable are monitoredfrom separate field devices. When bothtransmitters are functioning properly,the Average of the two is used as theresultant controlling signal.Upon excessive deviation betweenthe two measurements, or the failureof either one, the control systemautomatically selects the signal that iscloser to the arbiter, and an operatoralarm is generated. Automatic controlcontinues, uninterrupted. Maintenancecan be performed on the offendingsignal without loss of runtime.Dual Transmitter Algorithms have been used for feedwater controls such as Steam GeneratorFeedwater Flow and Steam Generator Steam Flow.

Three independent measurements of the same processvariable are monitored from separate field devices. Whenall are functioning properly, the Median of the three is usedas the resultant controlling signal. Upon the failure of onesignal, the control system automatically continues to select theMedian value and automatic control continues, uninterrupted.Maintenance can be performed on the offending signal withoutloss of runtime. If one signal deviates significantly withoutfailure, it is excluded from control by the Median selector.

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