As factories become increasingly automated, machine safety in industrial applications, including motors and frequency converters, is becoming increasingly important. When safety is properly planned, it brings significant economic benefits such as increased productivity and reduced downtime without increasing the risk potential. , The optional safety function modules (FSO-12 and FSO-21) make it easy to extend the safety functions of the ACS880 frequency converters. The plug-in module is installed in the frequency converter and wired there. This means that various safety functions and diagnostics are implemented in one compact and reliable module.