What are the advantages of DCS over PLCs, and why is its enclosure so much larger?
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Is DCS really better than PLC? Looking at just the chicken cage: the lol unit is much larger than the PLC chassis, but their functions seem similar.
The functional differences are quite significant; phenomena are the external manifestation of essence. If you learn more about the details of DCS and PLC, you will understand.
You haven’t seen enough; DCS modules and their layout patterns come in a wide variety, with significant differences among them.
A 15-year veteran in industrial control tells you: 1. Differences at the software level: For example, in DCS systems, the upper-level and lower-level components are perfectly integrated, with internal communication protocols that make system maintenance easier when there are multiple upper-level units. PLCs are often independent at the upper and lower levels. 2. Differences in hardware: Chassis-type systems have been largely phased out; DCS systems feature a redundant design with dual CPUs and dual power supplies. The modules and terminal boards are plug-in type, which is very convenient as there is no need to assemble terminals or relays manually. It’s very easy for DCS to add a dot or a module. 3. Differences in applications: Use DCS when there are more than 64 points (mostly analog signals). For projects with fewer points or those that require a touchscreen, choose PLC; the main reason for this choice is cost.
The directions are different; PLC is more suitable for assembly lines
The main difference lies in the way signals are processed: the CPU of a DCS is better at handling analog signals, as it has a higher processing frequency. On the other hand, a PLC is more suitable for dealing with digital signals; it cannot handle too many analog signals, as this would slow down its performance. For example, the domestic control system ECS700 allows a single CPU to process up to 4,000 analog signals, and each analog signal corresponds to 8 digital signals