How to calculate the communication network load of a DCS? Please ask the experts for advice
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Similar descriptions are often found in bid documents or technical specifications; for example: Mother bus load: 30%. I would like to ask the experts: how can network load be estimated? What is its relationship with the data polling method? (My main concern here relates to the field bus layer; according to the technical documentation provided by the manufacturers, the communication speed of the field bus is 2.5 Mbit/s. There are approximately 700 points per controller, so it’s difficult to determine accurately what the load on the network will be.) It seems that the network aspect represents a significant challenge for me; I would appreciate some guidance from those with more experience.
Reply 1# tina_dong Please give some advice! !
The network load can only be seen after the system is actually put into use. Many new DCS systems today use 100M communication buses, so there should be no problems in this regard; it’s sufficient to pay attention to the load on the controllers!
I want to know; who can give a specific answer! !
Could you be more specific? The load of each system should be distinct. How do Hollyland, Emerson, Zhejiang University, Siemens, and Omron calculate respectively? Where can I watch it?
How to calculate the load of a DCS communication network? This has been a problem that has troubled me for a long time. Is it the DCS manufacturer or the design institute that is responsible for the calculations?
It is related to the frequency of data communication via IO points; the more automatic control loops there are, the greater the network usage
First, count the number of digital and analog signal points that need to be communicated separately. For digital signals, the total is calculated as 3 bytes per signal; for analog signals, it is 6 bytes per signal. This total is then divided by the network communication rate.