I/O scanning time for DCS

Question

I/O scanning time for DCS

sulaa1 (Chemical)

(OP)

1 Nov 15 05:07

dear all

is there any standard regarding I/O scanning rate for Distributed control system (DCS)

I am trying to look for is there any written standard such ISA,IEC or others

Here my problem,
there is scanning option for all the I/O analog and digital.
there is 250 ms 500ms and 1 sec.

the argument is if I put all in 250ms I/O scanning time the CPU loading is very high but when choose 1 sec the CPU loading is lowered.
if there is any standard please let me know, that will help me on the argument.

IRstuff (Aerospace) · Answer 1 · 2015-11-01 06:14:49

Shouldn't the sampling rate depend on what you need, i.e., what are you trying to get out of the data?

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sulaa1 (Chemical) · Answer 2 · 2015-11-01 09:50:29

It is I/O processing in DCS, all the analog input and output.
I guess there is a standard on the scanning rate of the I/O.

I do hope some can help if there is standard or not.

IRstuff (Aerospace) · Answer 3 · 2015-11-01 17:08:05

Again, what does your process need? Why are you forcing the sampling rate to be so high? What did your process have before you installed the DCS

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I/O scanning time for DCS