System Description; Fso Module And Safety System Components - ABB FSO-21 User Manual

36 Overview

System description

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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, the FENA-21 module, the FSE module, switches and
buttons.
Safe stopping
Gate opening switch
Safety function requests
Prevention of unexpected
start-up
Emergency stop
Channel separation
The FSO safety functions module is an option for the ACS880 drives. The Safe
torque off (STO) function is a standard feature on the ACS880 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
from an FSO internal fault. Some safety functions can be permanently active. If the
drive does not fulfill the commands of the FSO, the FSO shuts down the drive using
the Safe torque off (STO) function.
If the drive is connected to a safety PLC, the safety of the fieldbus communication
can be secured with the PROFIsafe over PROFINET technology. The safety PLC is
connected to the FENA-21 fieldbus adapter module, which communicates with the
FSO module. For more information, see chapter PROFIsafe.
If a pulse encoder is used in the safety system, it is connected to the FSE-31 module,
which communicates with the drive and the FSO-21 module.
PROFIsafe over PROFINET
Safety PLC
system controller
Key switch
Stop button
FENA
FSO
FSE