Learning about Siemens S7-300 help in understanding DCS and SIS?
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Are they highly similar in terms of hardware and software? One more question: can an AI node that comes from the field simultaneously access both the DCS and the SIS to participate in control and interlocking functions? Or in other words, can a valve on-site be controlled simultaneously by both the DCS and the SIS?
I’ve seen AI systems that come from the field connect to safety barriers with one input and two outputs, in order to access either Siemens’ DCS or Conixion’s SIS.
This post was last edited by budaoweng123 on 2015-11-1 08:15. The first question is as mentioned by the brother above. The second question: it is feasible for on-off valves. For example, you have a valve with two solenoids, one connected to the DCS and the other to the SIS. Of course, it can also be controlled by participating in the SIS logic through the DCS DO points. Most systems are interconnected; if you become proficient in Siemens PLCs, it becomes much easier to learn other systems.
Personally, I don’t think it’s very helpful; ladder diagrams and function block languages are not the same thing
I agree with what was said on the third floor. To add, the standards for SIS are higher than those for DCS, so care should be taken when selecting sensors and safety barriers.
It’s definitely helpful; it just depends on the perspective from which you look at it! ! ! !
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Studying the S7-300 is of little help in understanding DCS and SIS; the S7-300 is a programmable logic controller, which is quite different from distributed control systems DCS and safety instrumented systems SIS.
I’m on site, working on 485 communication. I met someone from Siemens who is working on the software interfaces for DCS and SIS, as well as on creating variables; it’s quite similar to Step7. There’s definitely some help available, and it will be even more useful if I use Siemens’ DCS in the future. It seems that DCS handles more tasks compared to PLCs, whether it’s in terms of communication data processing or logical control, as well as functions like 3-out-of-2 selection; such things are generally not involved in PLC operations. Personally, I think the level of assistance depends on how far PLC has progressed.