Intelligent equipment

Familiarity with intelligent equipment

Devices in the field of intelligent equipment and bus field technology are features of advances in DCS technology that will replace the traditional I / O subsystem.

These smart devices eliminate the need for intelligence for simple sensing and control techniques and move towards primary sensation and stimulus devices.

And thus replaces the need for a DCS controller to perform routine sensing and control process.

These field devices can be connected directly to the bus field, and the source of multiple measurements to the higher level control station is possible through the digital transmission line and by removing ancillary hardware such as local I / O modules and controllers.

Smart devices

Operation and operation of DCS intelligent system

DCS operation goes like this: sensors sense information processing

And sends it to the local I / O module, which is also connected to the drivers that are supposed to control the processing parameters.

Information or data from these remote models will be collected for the processing control section via the bus field.

If intelligent field devices are used, the sensed information is transmitted directly to a processing control unit via the bus field.

Operation and operation of DCS intelligent system

The collected information is then processed and analyzed and produces output results based on the control logic installed in the controller.

The results or control operations are then transmitted to the actuators via the bus field.

The DCS positioning and steering and the installed control logic are transported to the engineering station mentioned earlier.

Operators will be able to see and send control operations manually to the operating station.

The difference between the SCADA systems

Although both monitoring and control mechanisms are in industrial installations, there will be differences in objectives.

There are some commonalities between the two in terms of hardware and components, but there are definite end-use requirements that separate a powerful and cost-effective DCS from a viable SCADA system.

Some of these differences are listed below.

Scada system differences

DCS tends to process and SCADA tends to collect data. DCS focuses more on control control and consists of a level of regulatory control.

And as part of doing so, provides information to operators.

SCADA focuses more on data acquisition and provides it to the operator and control center.

In DCS, data acquisition and control modules or controllers are usually placed within a more restricted area, and communication between distributed control components is done through a local area network.

SCADA generally covers a wider geographical area and uses different communication systems, which are usually more unreliable than local area networks.

DCS uses a closed loop control at the processing control station and at the remote terminal. SCADA does not have such a closed loop control.

DCS is driven by the processing state in which it monitors the processing on a regular basis and displays the results to the operator. Even when needed, SCADA is event-driven, in which it monitors the processing sequence. Does not, but waits for an event that triggers the processing parameter to initiate specific actions. So the DCS database does not hold the processing parameter values ​​because it is always in relation to its data source, while SCADA maintains a database to record parameter values ​​that can It is later retrieved to the operator for display, forcing SCADA to provide the last recorded values ​​if the base station is unable to reach new values ​​from the remote location.

In terms of applications, DCS is used for installations within a restricted area, such as a single plant and a control process set. Some DCS range of applications include chemical plants, power plants, drug plants, oil and gas industries, and so on.

On the other hand, SCADA is shrinking for wider geographical locations such as water management systems, power transmission and distribution control, transportation applications, and manufacturing industries.

Common processing automation standards

Contrary to these major differences, modern DCS and SCADA systems will come with common standard features related to factory processing automation.

However, the choice between DCS and SCADA depends on the customer and the needs of the application. But if the customer option is assumed between the two with equal processing output, DCS is an economical option that helps reduce costs and provides better control. .

DCS systems from different vendors

Some available DCS systems include:

• ABB-Freelance 800F and 800 xA
• Yokogawa-Centum CS 3000 and 1000
• Honeywell-TDC 3000
• Emerson-Delta V Digital Automation
• Siemens-Simatic PCS 7
• Allen-Bradley-NetLinx