Is 3 out of 2 determined by the majority rule through comparison?
Thread Content
Is 3 out of 2 determined by the majority rule through comparison? If an IO, after 2oo3 processing, outputs 2 ones and 1 zero, and it happens that the 1 is the incorrect value while the 0 is the correct one, what should be the output?
The principle behind 2OO3 is that the likelihood of both channels failing simultaneously is low. If it’s as LZ said, there’s nothing that can be done, unless it’s designed as 3OO5 or a higher level
Choosing 2 out of 3 only reduces the likelihood of misjudgments caused by the current instruments; it’s impossible to eliminate them entirely
If the outputs of both channels are incorrect, then the output will naturally be incorrect as well
Is 3 out of 2 determined by the majority rule through comparison? It is a 3-to-2 logic: among the three input signals, if any two of them are true (1), the output is true (1); otherwise, the output is false (0). There are two possible scenarios in the situation you mentioned: (1) the relay is normally open (in domestic systems) or normally closed (in foreign systems). (2) Constant comparison (analog comparison) Solution: Introduce a \"NOT gate\" into the logic to meet the operational requirements.
There are three instruments on-site; for example, for the unit’s lubricating oil 3OO2, there is another instrument that divides this value into three channels