Safety functions 77
STO with speed limit activated SBC
This safety function requires that you use an encoder in the safety application.
The operation of the STO with speed limit activated SBC is described in the time
diagram and table below. For configuration, see section How to configure STO with
speed limit activated SBC on page 337.
A STO SBC speed (parameter SBC.14): Speed limit at which the FSO activates the SBC
function (brake).
B Zero speed with encoder (parameter FSOGEN.52): Speed limit at which the motor has
stopped, the safety function is completed and the STO completed indication (parameter
STO.22) goes on. The acknowledgment becomes allowed.
C Restart delay after STO (parameter STO.13): Time from the STO activation to the
moment when the acknowledgment becomes allowed. With this parameter, you can
allow a restart of the drive before the motor has stopped (fly-start). You can use this
feature only in certain applications. This parameter is relevant only when an external
request activates the STO function.
Drive STO state
& indication
STO request
Motor speed
Time
STO completed
indication
1
6
5
SBC output
3
B
4
A
C
STO.13
2
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