Answer / sumith

The main difference is that
the PLC has one processor(it has limitations for memory
space) and it can used to control one plant or 2 small plants.
The DCS has many processors and it can be used for control
many plants at one time.

Answer / sandip patel

plc has central controller where as dcs has dictributed control.
scanning time of the dcs is more than plc.

Answer / karikhul

plc is centralized controller while dcs distributive.plc has 1 processor card n dcs has 2 processor cards if one fails means v can copy d content frm one 2 another jst lyk master n slave. so it wont disturb d plant also.

Answer / shinde k v

plc means programmable logic control which has fixed
program .dcs means distributed control system which
distribute functionally and physically.

Answer / goutam

The main difference is that PLC needs an external SCADA s/w for process visualization bt in DCS scada is inbuilt.

what are the basic instructions used in simatic s7-300 plc?

5 Answers   Dr Reddys, HZL, Siemens,

in the pipe line if the control valve fails to respond to controller action,by what means we can stop the flow in the pipe line ?

9 Answers  

What is the difference between sdv and bdv ?

1 Answers  

what is the process to make control schematic ?

0 Answers  

Why the ammonia and Nitric Acid level indicators is with millimeter ? and What is the conversion form millimeters that level indicator indicate to weight ?

0 Answers   EHC,

what is meant by control valve sizing?

3 Answers  

our kks tagging is crossing more than 12 character please suggest how to take tags in the DCS

0 Answers  

what is the diffrence between LCN and UCN

2 Answers  

few questions on RS 232,1 question on relationship of impedance and turns ratio, many questions on flowmeters

0 Answers   Monnet,

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.

0 Answers   Chevron,

how to calibrate an error for pressure transmitter, make it easy to understand

2 Answers   Descon,

HOW THE ORIFICE & PRV SIZING BE HAPPENED -- EXPLAIN IN BRIEF

3 Answers