DCS vs. SCADA

1. Processing Times

Processing times are somewhat slower in the DCS versus the PLC/RTU SCADA environment.

While this is not necessarily problematic, it could have an impact on processes that are very time-sensitive.

2. Communications Protocols

Communications within a SCADA system can vary widely and have adapted to the changing technologies while the DCS has also adapted, there are still some proprietary communications that can be challenging.

3. Safety

It has been said that if safety is a priority then the DCS is the route to go.

However, nowadays, with the abundance of safety processors, a SCADA system may also be selected.

Summary

To sum things up, in today’s market, there are not massive differences in the systems.

DCSs have integrated operator interface software with tag databases, while SCADA requires you to purchase additional software and build or import your tags.

If you have a very time-sensitive process, SCADA systems may have a slight advantage as the processing time is faster.

Concerned about safety? Advantage DCS.

Need an open communication architecture? Advantage SCADA.

As you can see, there are a lot of similarities between the two systems.

Either way, you go, hopefully, this article has shed some light on both the similarities and differences between the two systems.