Answer Posted / www.islamqa.com

# PLC is first designed for 0n/off - discrete control, but
by time it had PID and analog algorithms.

# DCS from its start mainly designed for analog ad PID
control.

# now with great achievement in PLC h/w and networking
capabilities, with good engineering one can build his own
DCS from multiple PLCs - but it will not give the same DCS
features and functionality.

# DCS is pre-built system, ready and easy to use, has its
own compatible h/w and s/w integrated and tested.
It has features of:
- Instrument management.
- Alarm managment.
- Data collection and management.
- Smart, self diagnostic capabilities.
- Event and history recording.
- Advanced control strategies.
- Easy drag and drop features.
- Redundancy.

As mentioned, we can build DCS from multiple PLCs, but it
will not be the same as the prebuilt system.

Regards,

Ahmed Sabry
Control and Instrumentation Engineer
GPC - General Petroleum Company
ahmedsabry.online@gmail.com
CELL.: 00 2 0121367310

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