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What are the types of switch outputs? And how do these switches connect to the safety barrier?

2018-05-23View Original

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1. One type is a signal output via a DPDT relay, with two sets of normally open and normally closed contacts; the contact rating is AC200V 5A and DC24V 5A. 2. The other type is a NAMUR output. How should one choose the safety barrier to use with these two types of DCS? What other digital signal forms are there besides the two mentioned above?

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