ABB FSO-21 User Manual

60 Safety functions
SSM
• SSM indication goes on when the motor speed is in the user-defined range. The
FSO module switches off the indication when the monitored speed exceeds the
configured limit.
SDI
• SDI active state is indicated when the motor rotates in the correct direction. The
FSO module switches off the indication when the function is acknowledged or the
rotation direction changes to the forbidden direction (this also causes the SDI to
trip, that is, the FSO module activates the SSE function).
For further information on indication and output parameters, see chapter Parameters
on page 401, and FSO PROFIsafe profiles on page 201.
 FSO modes
The FSO can be in one of the following modes:
• Power down: The power to the FSO is off. The drive STO circuit is open. The
POWER LED is off.
• Start-up: The FSO is starting up after power-up. Indicated with a blinking green
RUN LED.
• Running: The FSO is up and running. It can be in different states (see section
FSO states on page 60) depending on the status of safety functions and the
safety fieldbus communication. Indicated with a green RUN LED.
• Fail-safe: There is a failure in the FSO. The drive STO is active. Indicated with a
red STATUS/FAULT LED. You have to reboot the FSO to exit the Fail-safe mode.
See section Transitions between FSO modes and states on page 61.
• Configuration: Parameters are uploaded from the FSO module. The drive STO
is active. Indicated with blinking RUN and STATUS/FAULT LEDs. You can exit the
Configuration mode by downloading the new configuration to the FSO or by
rebooting the FSO.
For more information on the FSO LEDs, see section Status LEDs on page 489.
 FSO states
When the FSO is up and running, it can be in one of the following states depending
on the drive STO status:
• Safe: STO active, that is, the drive STO circuit is open and the motor is stopped.
The SBC is active (if used).
• Operational: STO inactive.
In the Operational and Safe states, the FSO can execute the safety functions.
Note: When the POUS function is active, the FSO module is in the Operational state
and the drive STO is active.

ABB FSO-21 Specifications

General

Brand	ABB
Model	FSO-21
Category	Control Unit
Language	English