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What is the main Differences between PLC and DCS and why not use PLC instead of DCS as the grow more powerful and reialable?

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تم إضافة السؤال من قبل Mohammed Ahmed , Field Service Engineer , Siemens LLC
تاريخ النشر: 2013/12/24
Paul Hillman
من قبل Paul Hillman , HVAC Technical manager , Harrods

These days there is no real difference between PLC and DCS systems.

Of course there are differences between manufacturers equipment but most modern systems are capable of doing the work of emulating relay logic (PLC) and analogue control (DCS) with intelligence, integration and SCADA capabilities all available if needed.

Some systems may have more resilience, redundancy, be more capable in certain areas or maybe just more visually dynamic. Each manufacturer will have a reason why they say their system is better. Often it just comes down to cost per point or a client specification requiring a specific system over another.

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Hassan Javed Sheikh
من قبل Hassan Javed Sheikh , Research Officer , Heavy Industries Taxila

                        DCS                                VS                                        PLC

1.   Single vendor                                                                    Mutiple

2.    Small Area /LAN                                                            Large Area/WAN

3.    Many I/O                                                                         Less I/O

4.  Use for Monitoring                                                       Used for Controlling

Musharif Hussain
من قبل Musharif Hussain , Sr. Engineer (Instrumentation &Control) , Matiari Group

When we come to PLC, it is best for batch processing or machine control, it takes lesser time and good control. But when we are talking about DCS, it is better in process control especially in non-stop/contrinuous processing.

The world is becoming small, DCS offers more varieties than PLC, and today PLC and DCS combining and automation is growing. In past PLC was not helpful when we face any trouble, it have to shutdown to change the program. But DCS produce intime change in program, means during the process, we can change the program according to our needs without stopping the process.

Morteza Shamayeli
من قبل Morteza Shamayeli , Technical Manager , Novin Azmayan

DCS is mostly used for huge plant with a lots of I/O ( more than 10 thousand )  and it is reasonable for this kind of application , but for smaller application with less I/O PLC can works well with lower price , in some how we can say PLCs, PCs , other devices in network can be parts of DCS configuration

MUHAMMAD IBRAHIM
من قبل MUHAMMAD IBRAHIM , As Science teacher , Al-khair public and secondery school

DCS has a main control, PLCs are connected also in the network. While PLCs are the controllers through  Stand-alone Platform.

Jovanni Miano
من قبل Jovanni Miano , Electrical Technician , Abunayyan Trading Corporation (Maharah Human Resources)

DCS is a wide network control system (SCADA/BMS) which has a main control, PLCs are connected also in the network. While PLCs are the controllers through BACNET or in Stand-alone Platform.

Harisena Febriadi
من قبل Harisena Febriadi , OPERATION ENGINEER , PT. PATRA SK

PLC is kind of opposite DCS, I/O processsing using one module, DCS I/O module and processing is different module. DCS is more powerfull than PLC because is design for large plant and can be connected to PLC (Remote)

prakash katugali
من قبل prakash katugali , Contract shift electrical engineer , Karnataka power transmission corporation limited

PLC-The system has processor and I/o's and some functional units like basic modules, communication modules and so on. uses a scada for visualization. generally the scada does not use a central database.

DCS-is often used in the big plants where the redundancy level needed is more and the analog input used are high.

مستخدم محذوف‎
من قبل مستخدم محذوف‎

PLC and DCS both are accurate and relaiable systems, the difference is not the accururacy but the requirements and objectives.like

The PLC is controlling a machine, while the DCS is controlling the plant.

The actuall question should be, how to select the right system.

The seven questions are designed to make one think about company's operating philosophy and application requirements, taking into account the point of view of all the major stakeholders in your plant (engineering, operations, maintenance, etc.).

1. What are you manufacturing, and how?

2. What is the value of the product being manufactured and the cost of downtime?

3. What do you view as the "heart" of the system?

4. What does the operator need to be successful?

5. What system performance is required?

6. What degree of customization is required?

7. What are your engineering expectations?

 

Here i share a link, hope to be useful .

https://w3.siemens.com/mcms/process-control-systems/SiteCollectionDocuments/efiles/pcs7/support/marktstudien/PLC_or_DCS.pdf

مستخدم محذوف‎
من قبل مستخدم محذوف‎

Scanning time of PLC is quicker than DCS but DCS is good for process control industries for large I/O's and reduntancy. 

Mohan Shanmugavel
من قبل Mohan Shanmugavel , ELECTRICAL TECHNICIAN , DUBAI ALUMINIUM

Pesently advanced PLC s offering complete DCS type contollers by SFC, STL etc. Ex AB plc Control logix can be used as DCS.

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