What is the difference between PLC and DCS?
Answer Posted / eid elatawy
PLC is a programmable logic controller which take the inputs from the system and execute it through the program written by Ladder or STL (statement list)language and provide the output to the system.the famous CO Siemens,Allen Bradly.
DCS is distributed control system the same idea for PLC for take the input and execute it through the program to provide the output.the famous CO Yokogawa,Honeywell
We can enumerate the difference as following:-
PLC
1- no of points less.and almost of these points digital points.
2- no of analog points very less.
3- trends and history not allowed.
4- used for machines and separate units with HMI and in this case called SCADA system.
5- cost is less and easy to make extension.
6-scanning time less.
DCS
1- you can use more than 10000 points
2- no of analog points more.
3- trends and history allowed and saved in server for along time.
4- used for a big plants like oil&gas-chemicals and petrochemicals..
5-cost very high and you have to min cost of the system + no of points separate. so the extension not easy like PLC
6- Scanning time more than PLC.
7- We can monitor the all inputs and control all outputs
Regards
Eid Elatawy
I&C Engineer
TCI sanmar chemicals CO
Port said
Egypt
contact no- 002 01000470262
mail- eng.eid72@gmail.com
Is This Answer Correct ? | 3 Yes | 2 No |
Post New Answer View All Answers
What are the uses of orifice plates?
1.can you use SCADA instead of DCS,DCS instead SCADA 2.Difference between DCS and PLC,can their role be reversed i.e. role interchange 3.Difference between RTU and PLC
Explain signal isolator
What is difference between ESD and PLC please Explain me clearly.
How to calibrate radar type level transmitter for interface level? Total liquid(liq.1 and liq.2), level both the liq individually? For. Both the liquid levels how the signal will go from transmitter to dcs? How to calibrate. Single radar 9:26:55 AM for 2 different liquids in a tank?
anybody having Qatar Petroleum questions for instrument Technician offshore ....please send me
can any one tell me when ongc placement test and its forms is available????/ pls tell me if u know
how to calibrate and troubleshooting of leveltroll?
Which types of quections asked in interview for FORMULATION PLANT (PHARMA)
What is the difference between working pressure and calibration pressure of a control valve
need to calculate flow rate with the help of dp range and orifice bore dia and size. range is 0 to 400 inwc and orifice size is 12 inch 150 # rf and bore dia is 7.180 inch. need to calculation for flow rate
When doing a liquid seal on a differential flow transmitter , most of the time the sealing liquid will be heavier then the process fluid. For wich application will the sealing liquid be lighter than the process fluid if transmitter is mounted below the process line.
How to Calibrate Ultrasonic flow Transmitter in Field
Calibration procedure for water rotameters
what is a half wave, full wave, and bridge rectifer.