Transitions Between Fso Modes And States - ABB FSO-21 User Manual

54 Safety functions
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Transitions between FSO modes and states

The following diagram shows the possible transitions during normal operation of the
FSO module.
• Power down:
• Start-up:
• Configuration: STO active, setting of parameters
• Operational:
• Operational:
• Safe:
• Fail-safe:
Power down
(STO active)
Start-up
(STO active)
Operational
(STO inactive)
(STO, POUS active)
STO active, power off (below 19 V)
STO active, power on (above 19 V), start-up checks performed
STO inactive, FSO running
STO active, POUS active, FSO running
STO active, FSO running
STO active, I/O, FSO or communication fault detected.
Internal fault
(STO active)
Acknowledgement
Fail-safe
Drive composer pro
Configuration
(STO active)
RUN
Safe
(STO active)