Pros Cons DCS & PLC

PLC

DCS

+++

• Flexible programming

• Follow vendor standard

• PLC

• more Engineering Time

• 60% faster Engineering time compare to PLC

• DCS

• Open protocol
  *easy to integrate to other device

• Proprietary protocol

• PLC

• Integration needed between controller to HMI (SCADA)

• Integrated software between controller & HMI

• DCS

• Customization is Easy

• Follow vendor standard, customization is not recommended

• PLC

• for IO below 10,000

• applicable for more than 10,000 I/O

• DCS

• Low cost hardware

• Pricy hardware

• PLC

• IEC 61131-3 Programming skill required

• no Programming skill required.

• DCS

• applicable for fast response application

• slower cycle time compare to PLC

• PLC

• Limited loop control (PID)

• applicable for very large loop control (PID)

• DCS