theColonel26
Lifetime Supporting Member
So I have been trying to give myself a crash course is safety circuit design in the last few days. I put together these examples and I wanted to know what category they are.
Also: A system that employs a dual channel for everything (Input and Output) would still be considered a Category 1 unless it also employs some type of feedback to actually Detect Faults (reasonably), right? It could have 1 fault and still provide stopping functions, but more than 1 fault and it could possible disable stopping functions on 1 more or devices, right? For it to be a category 3 would mean the Whole safety circuit would have to be rendered Safe in the event of a fault.
I've read chapter 9 of the Allen Bradley SafeBook 5, But I am still not sure I am understanding this correctly.
I also Attached a PDF copy
Also: A system that employs a dual channel for everything (Input and Output) would still be considered a Category 1 unless it also employs some type of feedback to actually Detect Faults (reasonably), right? It could have 1 fault and still provide stopping functions, but more than 1 fault and it could possible disable stopping functions on 1 more or devices, right? For it to be a category 3 would mean the Whole safety circuit would have to be rendered Safe in the event of a fault.
I've read chapter 9 of the Allen Bradley SafeBook 5, But I am still not sure I am understanding this correctly.
I also Attached a PDF copy
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