OR and AND in interlocking
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As shown in the figure, there are four conditions in the interlock; what does the ‘or’ mean in the first and second conditions? Does it mean that as long as one of the two conditions is met, it’s sufficient? Or both need to be satisfied simultaneously? What does “and” represent? Thank you, extra points
You’ve posted quite a lot already; please think it through first. OR means or, and AND means and. It is sufficient to satisfy one condition out of 12, and one condition out of 34, in order to trigger the subsequent outcome.
In my opinion, your approach is also incorrect; please think about it first.
This post was last edited by Engineering-Industrial Angry Youth on May 4, 2018, at 17:23. I would greatly appreciate any advice. If you have different opinions, please express them directly
In accordance with the requirements of Clause 11.1.1 of GB/T 50770-2013 Code for Design of Safety Instrumented Systems in Petrochemical Industries, positive logic should be used for logical design; therefore, I agree with the view expressed on the second floor.
Or is the OR gate, and is the AND gate; the poster has returned digital electronics to the teacher
Or means or (as long as one of the conditions is met), and means and (all conditions must be met).
If the interlock is of fail-safe type, your approach is incorrect.
It mainly depends on what signal is output when the interlock condition is triggered; then it’s necessary to determine whether the interlock action is triggered by a value of 1 or 0. It seems that the diagram doesn’t show all the OR gates – as long as one of the input terminals has a value of 1, the output will be 1. For AND gates, the output is 1 only when all input terminals have a value of 1
This post was last edited by Xiao Liezi on 2018-5-10 at 19:09. The interlock system is of accident-safe type, in accordance with \"HG/T 20511-2000 Specifications for the Design of Signal Alarm and Safety Interlock Systems\".