Passive Safety with ASi – A cost-effective alternative

Passive safety with ASi is becoming increasingly more important as a cost-effective alternative in terms of machine safety. With passive safety, all outputs can be switched off and controlled without safety individually or, if required, entire groups of actuators can be switched off safely using a single safe output — simply by switching off the supply voltage to all connected actuators in the drive string.

https://www.bihl-wiedemann.de/en/applications/functional-safety/passive-safety-up-to-sil3ple.html