Page top

Primary Contents

Question

Why are two inputs required for the Safety Relay Unit?

Answer



European standards EN954-1 category 3 and 4 require that a single fault in any parts of the unit does not lead to a loss of the safety function. For this reason, the Safety Relay Unit requires two inputs.

Recommended Products

D4N

Upgraded Safety Limit Switches Based on the Popular D4D, Providing a Full Lineup Conforming to International Standards

F3SJ Ver.2

The updated F3SJ is even easier to use.

OS3101

Operator Presence Detection in Work Areas with Complex Shapes.

Other Safety Relays FAQ