ABB FSO-21 - Transitions between FSO Modes and States

Safety functions 61
 Transitions between FSO modes and states
The following diagram shows the possible transitions during normal operation of the
FSO module.
• Power down: STO active, power off (below 19 V)
• Start-up: STO active, power on (above 19 V), start-up checks performed
• Configuration: STO active, setting of parameters
• Operational: STO inactive, FSO running
• Operational: STO active, POUS active, FSO running
• Safe: STO active, FSO running
• Fail-safe: STO active, I/O, FSO or communication fault detected.
FSE module or encoder failure situation can also cause the Fail-
safe transition. See parameter S_ENCGEN.11.
Power down
(STO active)
Start-up
(STO active)
Configuration
(STO active)
Fail-safe
(STO active)
Safe
(STO active)
Operational
(STO inactive)
(POUS > STO
active)
Acknowledgement
Drive composer pro
RUN
Internal fault
Power
OFF / ON
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