The fail-safe sensors with 2 x PNP output (Gx70xS; Gx71xS) can be connected to approved two-channel safety relays without cross-monitoring. The evaluation units from ifm electronic enable functionalities such as muting or connection of e-stop devices to DIN EN 60947-5-1 without extra cost. The fail-safe inductive sensor detects metals and operates with an enable zone which is monitored for target position and dwell time.
Fail-safe devices or systems are not meant to prevent accidents or failures from occurring. Instead, they are put in place for when things do go wrong. Fail-safes are built with the expectation that failure situations will eventually happen. They prevent unsafe consequences when failure does occur. A fail safe system is one which, due to the characteristics of its equipment and components and the way in which they are integrated, is guaranteed that, in the event of any fault appearing, the system will always go to a safe status, normally affecting availability but never, and in no case, affecting safety.
Fail-safe characteristics means a design feature which prevents emergence of the primary beam, upon failure of a safety or warning device. The example of fail-safe circuit temporarily operates the air servo cylinder which cannot be operated correctly when the supplied air pressure decreases or when power failure occurs. Piston rod position setting and manual operation can be performed in the fail-safe mode.
