Distributed Control Systems (DCS)
- Control modules: to compute the control algorithm, execute logical expression
- IO modules: as an interface to field devices, Provide conversion from analog to digital and vice versa
- Workstation: as human machine interface, server, Historian, or Provide software utilities to do engineering
All of these modules are Communicate to each other via communication networks (Ethernet, fieldbus, Profibus, serial, etc).
Because of its distributed nature, the DCS is very powerful system to control a large petrochemical plant; the IO modules or control modules can be placed in a distributed area of the plant. The advance on communication systems also make it possible for DCS to be integrated to Various type of dedicated 3rd party systems, Such as PLCs.
In this post, I would like to present Several types and basic architecture of the DCS According to the manufacturer.
Foxboro I / A Series
The following figure is the basic architecture of Foxboro I / A Series system
Siemens PCS7
The following figure is the basic architecture of the Siemens PCS7
Honeywell Experion PKS
The following figure is the basic architecture of Honeywell Experion PKS
Honeywell TDC3000
The following figure is the basic architecture of Honeywell TDC3000
Honeywell Total Plant Solutions (TPS)
The following figure is the basic architecture of Honeywell TPS
Yokogawa Centum CS3000
The following figure is the basic architecture of Yokogawa Centum CS3000
Learning Materials - Siemens SIMATIC S7 and PCS7
Tutorial
Siemens Automation Cooperates with Education (SCE) provides tutorial materials on Siemens S7 in the following link:
Animation / Flash
The following is the presentation on Siemens PLCs for begineers:
The following links are a flash animation of Siemens S7 (right click to download):
The following link is the demo for Siemens PCS7 system (right click to download):
Books
Several books are available for good sources for studying the Simatic S7 (note That the following links Provide only the sample pages):
- Muller, J., Neumann, F., Pfeiffer, B., Controlling with SIMATIC , Willey-VCH, 2005.
- Jones, CT, STEP 7 in 7 Steps: A Practical Guide to Implementing S7-300/S7-400 Programmable Logic Controllers , Brilliant-Training, 2006.
- Berger, H., automating with SIMATIC , Willey-VCH, 2003
Master's Thesis
The following link is the Master's Thesis about Siemens S7 application:
The following links are the Master's Thesis about Siemens PCS7 application:
- Nordstrom, L., Construction of a Simulator for the Siemens Gas Turbine SGT-600 , Department of Electrical Engineering, Linkoping University, 2005.
- Ugarte, EG, Automatic Status Logger for a Gas Turbine, Department of Science and Technology , Linkoping University, 2007.
- Ljungkrantz, O., Steam Net Simulation with Real Control System , Department of Automatic Control, Lund Institute of Technology, 2003.
Further References
