Detecting and handling alarms on process variables for s7-300 plc-based monitoring system

Abstract

This paper presents block structure and script concept for detecting and handling alarm from process signals. The three process signals (analog, wirelessHART and Foundation Fieldbus (FF)) are collected, detected and analyzed to show process variable (PV) statuses. Programming by function block and script is assigned to detect 4-20 mA from analog input (AI), public data from wirelessHART gateway, and diagnostic data from FF device. The detected data are analyzed in order to solve the alarm status on PV, then their statuses are launched on the SCADA. Analog, HART, and FF level transmitters are configured with programmable logic controller (PLC) and SCADA software for level measurements that are a case study to show the implementation and experimental results. The proposed technique can be a guideline for end-users to configure and manage the several alarm data from 3 type process signals that have different capabilities to be taken into consideration when making an alarm with PLC and SCADA system. Moreover, end users could apply the data to show with SCADA system for prediction and to enhance process behavior.