36 Overview
System description
The FSO module includes various safety functions that can be used for implementing
safety functions in various applications, such as emergency stop, and safe speed
limiting, etc. as presented in the figure. The FSO module is one part of the functional
chain of the safety functions where external components together with FSO are
connected to create complete safety systems. This user’s manual gives overall
information on how to implement safety functions with FSO module, regarding the
SIL/PL requirements, functionality, and restrictions of use. The safety requirements
for the application are defined in the system-specific risk assessment. The system
integrator must obey those requirements when he/she implements safety functions
with the FSO module.
FSO module and safety system components
Example figure of a safety system with the FSO-21 safety functions module, the
ACS880-01 drive, a safety PLC, an FB module, an FSE module, switches and
buttons.
The FSO safety functions module is an option for the ACS880/DCS880 drives. The
Safe torque off (STO) function is a standard feature on the ACS880/DCS880 drives.
The FSO module does not operate the drive; it only monitors the actions of the drive
and commands safety functions to be executed. The request for safety functions can
come from an external safety system, for example, a push button, a safety PLC, or
Safe stopping
Prevention of unexpected
start-up
Emergency stop
Safety PLC
system controller
Stop button
Key switch
Gate opening switch
Safety function requests
Channel separation
PROFIsafe over PROFINET
FSO
FSE
FB mod
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