FAQ No. FAQ02378
Question
Why are two inputs required for the Safety
Relay Unit?
Answer
Safety categories 3 and 4 under EN 954-1 require that safety
functions are not lost if one part malfunctions.
That is why two inputs are required.
Other Safety Relay
FAQs
 What is the difference between Safety Relays and Safety Relay Units?
What is a positive common input?
What is the difference between a Safety Relay and a General-purpose Relay?
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