Working of DCS systems

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Published on March 12, 2014

Author: hameedakhtar155

Source: slideshare.net

Description

Distributed Control System Explained...

Hameed Akhtar 2k10-CHE-155

Working of DCS DCS is a control system which collects the data from the field and decides what to do with them. Data from the field can be: - Stored for future reference - Used for simple process control - Use in conjunction with data from another part of the plant for advanced control strategies

Elements of Distributed Control System  Field Control station (FCS) It consists of input/output modules, CPU and communication bus.  Operator station It isbasically human interface machine with monitor, the operator man can view the process in the plant and check if any alarmis presents and he can change any setting, print reports..etc  Engineering station It is used to configure all input & output and drawing and any things required to be monitored on Operator station monitor.

Components At first glance, the pictured system architectures look components:  „ Field devices  „ Input/output modules  „ Controllers  „ Human machine interface (HMI)  „ Engineering  „ Supervisory control  „ Business integration

Levels of DCS Control

Advantages of DCS 1. - Overall cost of the installation is lower 2. - Interface with the process is improved 3. - More reliable 4. - Flexible and relatively easy to expand 5. - Programming required to tailor the system can be done without knowing a high-level programming language

Vendors of DCS  Honeywell  Fisher-Rosemont  Baily  Foxboro  Yokogawa  Siemen

Uses DCS is a very broad term used in a variety of industries, to monitor and control distributed equipment.  Electrical power grids and electrical generation plants  Environmental control systems  Traffic signals  Radio signals  Water management systems  Oil refining plants  Metallurgical process plants  Chemical plants  Pharmaceutical manufacturing  Sensor networks  Dry cargo and bulk oil carrier ships

Disadvantages  Increased software development cost  More complex failure diagnosis and dependence on communication technology.  More Skills required By the Operators  Overall Process is Dependent on DCS

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