WHAT IS DIFFERENCE BETWEEN PLC(PROGRAMMABLE LOGIC CONTROLLER) AND DCS(DISTRIBUTED CONTROL SYSTEM)
DIFFERENCE BETWEEN PLC AND DCS
INTRODUCTION:
WHEN YOU ARE TALKING ABOUT INDUSTRIAL AUTOMATION THEN YOU ALREADY HEARD ABOUT THIS THREE TYPE OF CONTROLLING METHODS.
- PLC(PROGRAMMABLE LOGIC CONTROLLER)
- SCADA(SUPERVISORY CONTROL AND DATA ACQUISITION)
- DCS(DISTRIBUTED CONTROL SYSTEM)
MOST OF YOU CONFUSED ABOUT THIS TYPE OF CONTROL METHODS.
NOW IN THIS POST, I AM TRYING TO PROVIDE SOME LIGHT AND TRYING TO REMOVE CONFUSION ABOUT THIS TYPE OF CONTROLLING METHOD.
BEFORE WE START OVER CONVERSATION YOU MUST KNOW ABOUT FULL FORM OF PLC, SCADA AND DCS I AM ALREADY MENTION ABOVE BECAUSE GETTING SOME IDEA ON IT'S FULL FORM.
SO WE START WITH PROGRAMMABLE LOGICAL CONTROLLER.
IN THIS POST I AM ONLY TALKING ABOUT DCS AND PLS. AND FOR SCADA I WILL WRIGHT SEPARATE POST.
IN THIS POST I AM ONLY TALKING ABOUT DCS AND PLS. AND FOR SCADA I WILL WRIGHT SEPARATE POST.
PLC(PROGRAMMABLE LOGIC CONTROLLER)
AS SHOWN ABOVE, FULL FORM OF PLC IS PROGRAMMABLE LOGIC CONTROLLER. PLC IS MOSTLY USING FOR DOING SEQUENTIAL TASK CONTROL.
IN THIS PLC I AM ONLY TALK ABOUT CLASSICAL PLC NOT ON HYBRID ONE.
- STRENGTH OF PLC
BECAUSE IN RELAY LOGIC CONTROL FOR BIG INDUSTRY IS BECOME COMPLEX AND HARD FOR MAINTENANCE.
ALMOST MOST OF PLC IS DEAL WITH DIGITAL INPUT AND OUTPUT.
PLC PROGRAMMING DONE BY USING LLP(LADER LOGIC PROGRAMMING LANGUAGE).
PLC PROGRAMMING IS MUCH ERASER THAN MICROCONTROLLER PROGRAMMING USING C LANGUAGE WHEN YOU TALK ABOUT DIGITAL OPERATION.
SPEED OF PLC IS DEPENDENT ON SCANNING CYCLE OF PLC. HOW FAST PLC IS RESPONSE WHEN INPUT IS CHANGE.
PLC IS CENTRALISED CONTROL SYSTEM, ONE PLC MODULE IS OPERATE ALL PLANT. SO COMPLEXITY IS DECREASE WHEN YOU COMPARE TO OLD RELAY LOGIC CIRCUIT.
TODAY HYBRID PLC ALSO AVAILABLE, IT'S CAPABLE TO PROCESS ANALOG SIGNAL. BUT CONT IS ALSO INCREASE.
IN TERMS OF ECONOMICAL REASON PLC IS MORE CHEAPER THAN DCS AND SCADA.
FOR SMALL AND MEDIUM LEVEL PLANT PLC IS VERY USEFUL CONTROL ELEMENT.
- WEAKNESS OF PLC
WHEN THE PLC IS DAMAGE ALL PLANT WILL BE SHUT DOWN. BECAUSE PLC IS CENTRALISED CONTROL SYSTEM
MOST OF PLC IS ONLY COMPATIBLE WITH DIGITAL INPUT AND DIGITAL OUTPUT.
WHEN YOU WANT TO PROCESS ANALOG VALUE YOU INSTALL SEPARATE ANALOG MODULE IN PLC.
PLC IS SINGLE LEVEL CONTROLLING SYSTEM SO WE ONLY CONTROL SPECIFIC NUMBER OF CONTROL LOOPS.
PLC IS DONE OPERATION IN SEQUENCE SO, IT IS DOES NOT HANDEL MULTI-LOOP AT A TIME.
DCS(DISTRIBUTED CONTROL SYSTEM)
SO AS PER NAME SUGGEST YOU PROBABLY YOU GET SOME IDEA 💡 ABOUT DCS.
DCS IS ONE OF THE TYPES OF CONTROL SYSTEM THAT IS USED IN INDUSTRIAL LEVEL AND WHENEVER YOU TALK ABOUT DCS IT IS USE IN LARGE SCALE INDUSTRY LIKE POWER PLANTS, CHEMICAL PLANTS AND OTHER.
IN LARGE LEVEL INDUSTRY THERE ARE THOUSANDS OF LOOP IS PRESENT. SO FOR CONTROLLING THIS LOOPS, DCS IS USE.
STRENGTH OF DCS
DCS IS MADE FOR CONTROLLING THOUSANDS OF LOOPS.
DCS IS MULTILAYER CONTROL SYSTEM. FOR OPERATING PLANT FUNCTIONALLY AND LAYERWISE.
DCS IS CAPABLE TO OPERATE MULTILOOP AT A TIME.
DCS IS MADE FOR MULTIFUNCTIONING AND FAST OPERATION IN INDUSTRY FOR CONTROL MULTILOOPS.
DCS IS CONNECTED WITH HIGH-SPEED SERIAL COMMUNICATION NETWORK. DCS INDIVIDUAL COMPONENT CONNECTED WITH SERIAL COMMUNICATION.
DCS IS FOLLOW HIERARCHY STRUCTURE FOR PLANT PROCESS CONTROL.
DCS IS REDUCE ENGINEERING EFFORT FOR CONTROL COMPLEX PROCESS LOOPS AND PLANT PROCESS CONTROL.
WEAKNESS OF DCS
DCS IS ECONOMICAL MORE EXPENSIVE THAN PLC ANTH OTHER CONTROLLING METHODS.
IN DCS IF ANY LOOP DAMAGE IS AFFECTED BY ALL OTHER LOOPS.
RE-INSTALLATION AND MAINTENANCE OD DCS IS EXPENSIVE.
DCS IS GENERATE UNEMPLOYMENT BECAUSE OF FOR OPERATING OF DCS ONLY A FEW ENGINEER IS NEEDED.
STRENGTH OF DCS
DCS IS MADE FOR CONTROLLING THOUSANDS OF LOOPS.
DCS IS MULTILAYER CONTROL SYSTEM. FOR OPERATING PLANT FUNCTIONALLY AND LAYERWISE.
DCS IS CAPABLE TO OPERATE MULTILOOP AT A TIME.
DCS IS MADE FOR MULTIFUNCTIONING AND FAST OPERATION IN INDUSTRY FOR CONTROL MULTILOOPS.
DCS IS CONNECTED WITH HIGH-SPEED SERIAL COMMUNICATION NETWORK. DCS INDIVIDUAL COMPONENT CONNECTED WITH SERIAL COMMUNICATION.
DCS IS FOLLOW HIERARCHY STRUCTURE FOR PLANT PROCESS CONTROL.
DCS IS REDUCE ENGINEERING EFFORT FOR CONTROL COMPLEX PROCESS LOOPS AND PLANT PROCESS CONTROL.
WEAKNESS OF DCS
DCS IS ECONOMICAL MORE EXPENSIVE THAN PLC ANTH OTHER CONTROLLING METHODS.
IN DCS IF ANY LOOP DAMAGE IS AFFECTED BY ALL OTHER LOOPS.
RE-INSTALLATION AND MAINTENANCE OD DCS IS EXPENSIVE.
DCS IS GENERATE UNEMPLOYMENT BECAUSE OF FOR OPERATING OF DCS ONLY A FEW ENGINEER IS NEEDED.
I HOPE YOU LEARN SOMETHING NEW. FOR ANY SUGGESTIONS COMMENT BELOW.
"INFORMATION THAT'S MAKE FUTURE BRIGHT"
BY-MK
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