It is said that Siemens, Schneider, and ABB are the three major high-end PLC brands. So, what are the key dimensions that define the “high-end” positioning of high-end PLCs? Is it their exceptional adaptability under extreme conditions? Is it their powerful processing speed and precise control performance? Or is it simply reflected in the high added value indicated by the price tag?
Let us discuss together: among the key indicators such as reliability performance, operational stability, data security protection, and network interconnectivity, which will become the focal points for the future development of high-end PLC technology?
NetizenA:
To be honest, so-called high-end PLCs are just those extremely expensive large PLCs. However, large PLCs do have their reasons; they have a solid hardware platform, and their stability and scalability outperform medium and small PLCs. But when it comes to performance… medium PLCs are actually faster in program execution speed and I/O response, which is a reverse upgrade.
Now Siemens and Schneider are shifting their strategies, with large PLCs gradually being taken over by DCS, while PLCs focus on discrete control. Only ABB is still stubbornly sticking to large PLCs…
NetizenB:
To put it simply, this thing is like a Swiss Army knife, with all kinds of functions, fully compatible with various interface protocols, and high performance with quick response. The only downside is—it’s painfully expensive!
Nowadays, the market trend is very clear: no matter how impressive the stability or how touching the craftsmanship, in front of the bosses looking at cost reports, it all becomes irrelevant…
NetizenC:
My three must-haves for PLC selection are:
1. The bus must be included (PLCs without field buses are inferior).
2. Programming must support ST language; IEC61131-3 standard is the baseline (no black box programming!).
3. The number of instructions must be sufficient for my project (those that are insufficient are just toy PLCs).
If these three points are met, it can be directly crowned as a “high-end PLC”! Those who understand will understand.
PS: Who in industrial control doesn’t have a bit of OCD?
NetizenD:
Now high-end PLC CPUs are starting to play tricks—directly kicking ASIC chips out of the group chat and switching to general-purpose CPUs. Isn’t this the so-called “soft PLC”? Moreover, the standard configuration for big players must include redundancy features. After all, the biggest fear of the client is a sudden failure on the production line.
PS: This move is both about saving money and wanting stability like an old dog… (dog head for safety)
What do you think makes high-end PLCs high-end? Feel free to leave a comment.
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