Control & Analysis Instrument
An Overview Of Distributed Control Systems (DCS)
“The global total revenue of Distributed Control Systems (DCS) will enhance to $23.37 billion by 2025 with a CAGR of 4.5% owing to a continuous adoption of automation systems (DCS) in various industry verticals, according to ResearchAndMarkets.com’s report.”
Market Highlights
Distributed Control Systems (DCS) plays a vital role in manufacturing industries as they are used to control and manage the processes. The networking capabilities of DCS are useful in the process management and the inputs or resulted outputs can be an analog signal or discrete signal.
Distributed Control Systems are used merely in the innovative emerging process industries as an extension of traditional controllers. The major concept of distributed control systems application is derived from the idea of decentralizing the control unit and establishing a common network between the engineering stations.
Figure: Overview of DCS Market Size and Forecast
Individually controlling, reporting, and monitoring the components are enabled using integrating distributed control systems with process plants. To manage the database, control logic, graphics, and system security, DCS uses a set of configuration tools. Moreover, it supports modification, upgrade, and integration to the existing architecture of any industry.
What is Distributed Control Systems (DCS)?
Distributed Control Systems (DCS) is a computerized control system for a process or plant that consists of a large number of control loops, in which autonomous controllers are distributed throughout the system, but there is central operator supervisory control.
DCS can be used to enhance reliability and reduce installation costs by localizing control functions near the process plant, with remote monitoring and supervision.
These systems are used on large continuous process plants where high reliability and security is required.
Structure of DCS:
As DCS contains the distribution of the control processing around nodes in the system, the complete system is reliable and mitigates a single processor failure. It will affect one section of the plant process; if a processor fails and the whole process will be affected when the central computer fails. This distribution of computing power to the field Input / Output (I/O) field connection racks also ensures fast controller processing times by removing possible network and central processing delays.
Referring to the diagram;
Level 0: It consists of the field devices such as temperature sensors, flow, and final control elements such as control valves.
Level 1: It consists of the industrialized Input / Output (I/O) modules, and their associated distributed electronic processors.
Level 2: It is included with supervisory computers that help to gather information from processor nodes on the system, and provide the operator control screens.
Level 3: It is the production control level, which does not directly control the process, but is concerned with monitoring production and monitoring targets.
Level 4: It is the production scheduling level
On the other hand, Level 1 and Level 2 are the functional levels of a traditional DCS, in which all equipments are part of integrated systems from a single manufacturer.
Levels 3 and 4 do not strictly process control in the traditional sense, but where production control and scheduling takes place.
Examples of DCS:
