The difference between PLC and DCS

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glrassin
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Joined: Tue Apr 21, 2020 3:54 pm

The difference between PLC and DCS

Post by glrassin » Wed Jun 03, 2020 12:37 pm

At first, about 40 years ago the PLC was used primarily for discrete controls. The programming of the PLC’s was primarily in ladder logic, which is a format that is very similar to a schematic.Receiving device information from the field, solving the logic and then energizing the outputs to produce the desired effect, PLC play an important role in manufacturing processes.Essentially, the PLC was invented to perform repetitive tasks in a reliable and durable manner.

As for the DCS, it was invented because of the increasing use of microcomputers. One of the primary advantage of DCS is that it have the integrated monitoring and control system similar to today’s SCADA systems. With an entire tag base which already created for the process control, the DCS system is available to use on the monitoring and control screens. Another advantage of DCS is that an entire plant could be connected via proprietary communications and controlled by a distributed system. Beside,DCS’s also had function block programming.Function block programming which is a section or several lines of code behind a single interface.By handling the manual and automatic operation of a valve, Function block programming can save a lot of time and redundant programming.

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