Answer / ebhaleme seggie

What is PID and how can it be used prscticslly?

Answer / gjhjyghyt hjy

polhpith.cv,;lbk,vcbcv

Answer / mohammed ibrahim khaleel

1. In PLC the heart of the system is a controller,
which contains all logics.
In DCS the heart of the system is HMI.
2. In PLC Operators primary role is to handle
exceptions where as in DCS Operators interaction is
required to keep the process in target.
3. In PLC Status information on/off, Run/Stop is
critical information for operator. In DCS analog trends are
critical, alarm management is Key to safe operation &
failure of HMI could force a shut down.
4. in PLC logic scan is very fast approx. 10 ms is
required to perform function i.e.to change status of motor
where as in DCS scan time is large i.e. 100~500 ms.
5. In PLC redundancy may not be cost justified where
as in DCS system redundancy is often required.
6. In PLC you can’t change configuration online. it
requires offline means shut down where as in DCS online
parameters can be changed i.e. no shut down is required.
7. In PLC analog control is simple PID control where
as in DCS simple to advanced PID control up to advanced
process control.
8. In PLC's use Ladder logic to configure application
where as in DCS use function blocks to configure
application.
9. PLC is useful for small plant application where as
in DCS is used for large plants or number of small plants
to a single platform.

Answer / d s patil

Now way days DCS & PLC both are similar.

Answer / irshad

PLC is a like various part of human body. suppose a part
not work still human body work and that part again work
after treatment

Answer / kalyan ram

DCS is nothing but connecting more PLC'S in a network and
monitoring it in a control station. The main difference is
in DCS it has in-built SCADA so it is user friendly whereas
in PLC we need to get a SCADA software.

Answer / sujay

plc is programmer logic controller where as dcs in
distributor controlled system. plc is doesnot have wide
range of communication , dcs have wide range of
communication.

Answer / p.c.mohanty.

Now a days there is no difference between PLC & DCS
PLC can perform every task as DCS or vice versa. The name
DCS or PLC depends on the system supplier as per
requirement of the customer . I feel it is better to call
the above systems as process automation system or process
control system in stead of PLC or DCS

thanks.

PCM

Answer / mukesh

plc has more number of instruction as compare to dcs

Answer / anil singh

PLC IS USED OPERATIONAL AMPLIFIRE, BUT DCS IS USED
MICROPROCESS

Plc is basically oriented for one job only,suppose if plc
fails then whole system will shut down,but in distributed
control system,you have a redundant plc for each plc so
that if primary system fails then its standby plc takes
over the charge.

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