Choice between PLC and DCS - how to choose the right control system?

2019-09-18

Choice between PLC and DCS - how to choose the right control system?

 

The choice between a programmable logic controller (PLC) and a distributed control system (DCS) depends on the project and plant type.Because of the application of different, the control system requirements are also different.

Process size: how many input/output (I/O) points are required?Small systems (< 300 I/O points) may have a smaller budget, so a PLC system is more appropriate.It's not easy to apply DCS to smaller projects. Instead, it works better in larger factory applications.With a global database, the DCS system is easier to manage and upgrade, and any changes are global.

Upgrade plan: PLC systems can be used for smaller industrial processes, but if the process needs to be expanded or upgraded, more PLC hardware and databases need to be added and maintained separately.This is a time-consuming, laborious process, and error prone.DCS are easier to upgrade to, for example, manage user trust from a central hub, and therefore easier to maintain and maintain.

Integration requirements: for stand-alone devices, PLC system is the ideal choice.When a factory is configured with multiple PLC systems, interconnectivity requirements arise.This is generally difficult to implement because you typically need to map data using communication protocols.Integration is fine, of course, but when there is a need for change, the user is in trouble: once a change is made to a PLC system, two PLCS may not communicate properly, because the data mapping is affected.For DCS, there is no mapping at all, and configuration changes are a simple process.The controller comes with the system.

High availability: processes with high availability requirements, DCS can provide redundant configurations.

 

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