Regarding the selection of DCS systems
Thread Content
To set up a monitoring point (mainly for monitoring) in around 100 DCS chemical process control systems, with two operation stations being sufficient; should a low-cost DCS system be chosen, what would the approximate budget be? What if PLCs are used instead?
Maybe I didn’t explain it clearly enough, but any general guidance would be helpful. I have some knowledge of PLCs and configuration, but not much about DCS; I mainly want some reference for choosing a solution.
100 points – are they simply 100 analog points, or a total of 100 points including both analog and digital points? It’s different! The prices of different brands also vary. If we choose Siemens’ PLC + configuration, we could discuss it! QQ:709274284
For PLCs, it’s more appropriate to have a larger number of DCS points
With an equivalent configuration using Siemens’ PLC, the cost should be higher than that of a DCS
It depends on the circumstances. 1. First, determine what kind of system you have. 2. Determine whether there are more analog values or more digital switches. 3. Personally, I think the fact that the original poster mentioned PLC indicates that it’s probably not some important or large-scale project; using PLC might be more appropriate in all aspects
It’s better to choose a PLC; it’s more cost-effective. I think DCS is suitable for applications with a large number of points.
Reply 1# wyj806: For non-redundant PLCs, the price is around 50,000 to 60,000; for redundant ones, the price is roughly double that.
lanfeng256, search for Siemens DCS on Baidu; Siemens’ DCS also ranks among the top ones
This post was last edited by huming18 on 2010-12-4 06:21. The issue here is that the original poster mentioned using a PLC to make decisions based on the number of points; it’s not meant for running an entire system. If other performance requirements are not very high, it is recommended to use a PLC. For chemical industries, AB or Schneider PLCs are suitable options. Choosing a DCS may result in higher initial investment as well as greater maintenance costs later on
It is recommended to use domestic DCS systems; there’s no need to specify which brand exactly – the poster can simply search for it online. Relatively speaking, domestic DCS systems are cheaper than foreign PLCs, not to mention DCS systems in general. The key factor is the scale of one’s project: for smaller projects, there’s no need to waste money