Difference between PLC and DCS
Difference between PLC and DCS
PLC
PLCs are can respond to a change within one tenth of a second
DCS
DCS are slower than PLCs. Typical respond time of DCS is 30ms
PLC
A PLC is capable of handling few hundred IOs. It can handle tens of them.
DCS
A DCS can handle thousands of IOs. It can handle hundreds or even thousands of analogs IOs and PID functions
PLC
PLC can programmed be programmed based on our application
DCS
DCS comes with built in control functions that need to be configured based on the application
PLC
PLCs can be made redundant with additional hardware which makes them expensive than DCS
DCS
Redundancy is a default feature of distributed control systems.
PLC
PLCs have a simple and flexible architecture. A PLC system consists of controllers., IO modules, HMIs and an engineering software.
DCS
DCS system are less flexible. They come with controllers, IO systems, database servers, engineering and operating servers.
PLC
PLCs are best suited for dedicated applications that changes less often.
DCS
DCS is suitable for complex processes that require advanced process control capability
PLC
Less expensive
DCS
More expensive
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