dcs vs plc for desalination plant

[jamunasaiganesh]

hi
i am doing the engineering for a desalination plant with a DCS based control system. no of i/os works out to approximately 1400 with a majority of digital signals. what is best for this application? dcs or plc?

 

[jsummerfield]

The process is continuous and the I/O count is reasonably high. I gather that most signals will be from transmitters instead of switches. If so, a DCS should fit well.

John

 

[HANKY]

Today PLCs manufacturers do offer powerfull configuration and Process management tools able to design complete process controls algorithms and sequential logics without requiring complicated DCS systems.

Schneider's new development platform: UNITY do offer the capabilities of a small DCS system at reasonnable costs.

Worth to mention also a new era of ruggedized "open" controllers on industrial redundant Ethernet at even lower costs than PLCs complete with a powerfull development platform such as the MTL Instruments: M.O.S.T. system . and their Workbench tools. In addition, the MOST controllers do not require local stations nor control rooms nor costly protective buildings or installations . Eveything can live outside at temps from - 40°C to + 70°C ambiant...in standard junction boxes..!

 

[InstruEngineer]

HI
Check out this Thread
Yoiu will understand the difference between PLC and DCS
thread791-74676

Hemant

Instruite
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