2. 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
3. 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.
4.
5. 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
10. 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
12. 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
13. 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
