THE CONVERSION PROCESS OF DCS TO PLC-SCADA SYSTEM IN A MEDIUM SIZE PLANT

Year 2003, Issue: 005, 135 - 146, 15.12.2003

Nihat Ada Yılmaz Aslan Serdar Tunaboylu

Abstract

The process conducted at Eti Gurnus has complex process control system

and it is working under automation with many instruments. The observation of

analog and digital input/output assigned in all units of the Eti Gumus plant and their

PID control were managed by Distributed Control System (DCS). It was required to

update and/or design new system in order to support new units that will be added in

the future and solve the problems accruing in the software hardware of the DCS. In

addition, proposed control system to Eti Gurnus should not be expensive and it

should be compatible with other systems.

Programmable Logic Controller (PLC) and Supervisory Control and Data Acquisition

(SCADA) were preferred and used instead of DCS in the system. Ethernet and

Modbus + protocol were used to communicate using all variety of the advanced

technology to obtain user-friendly system.

In this paper. PLC and SCADA were compared with DCS. The design criteria of

control system setup. application of the methods and alternative solution were

explained in detail.

Keywords

Distributed Control System (DCS), Programmable Logic Control (PLC), Process Control

ORTA OLÇEKLi BiR PROSESiN DCS'DEN PLC-SCADA SiSTEMiNE DONUSTURULMESi UYGULAMASI

Abstract

BlI makalede, orta olcekli bir endUstriyel prosesin PLC-SCADA sisternine

donusturulerek eski sistemin darbogazlannm giderilmesi incelenmlstir.

PLC ve SCADA sistemleri tarutilarak DCS ile karsilasunlrnas: yapilrmsnr. Proses

kontrol sisteminin kurulmasmdaki tasanrn kriterleri. uygulanan metotlar vc altcmatif

cozumler detayh olarak ele almnnsur.

Yapilan cahsmalar scnucunda sistcmde DCS yerine guclu bir PLC ve SCADA

kullanilarak kullarush ve gorse I bir sistem olusturulrnustur.

Keywords

Programlanabilen Lojik Kontrolor (PLC), İşlem Kontrol, Dagılmış kontrol sistemi (DCS)

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