The optional safety functions module (FSO-12 and FSO-21) provides an easy way to extend safety functions in ACS880 series drives. 

This plug-in module is installed and cabled inside the drive, enabling different safety functions and diagnostics in one compact and reliable module. 

Depending on your needs, ABB offers an encoderless variant of the safety functions module (FSO-12) with six safety functions in it. 

There is also a safety functions module (FSO-21) available that offers eight safety functions enabling the use of encoder feedback (FSE-31). 

The FSO-21 includes the same safety functions as the FSO-12, but offers two additional safety functions for your drive.

You can enable PROFIsafe over PROFINET connectivity, between your ACS880 drive and the safety PLC by adding the FENA-21 fieldbus adapter module to your drive. This way you will have a more flexible safety solution with the possibility to add safely-limited speed (SLS) to your application while it is in use.

Both safety functions modules have SIL 3/PL e capability and conforms to European Union Machinery Directive 2006/42/EC. The safety functions modules are TÜV Nord certified.

Selection and configuration of the safety functions is done using the Drive composer pro PC tool. Functions that are included in safety functions module are:

Inside the FSO-12 and FSO-21:

Additional safety functions inside only the FSO-21: