Sto Feedback - Danfoss iC7 Series Operating Manual

Operating Guide | iC7-Automation Functional Safety
Safe Input Ch. A/B
Ch.A
Ch.B
Safety function
Active
Inactive
Figure 10: Discrepancy Time

STO Feedback

4.3.5
STO feedback is a single-channel feedback signal which can be used for diagnostic purposes, and for providing an indication of an active
STO. It can help to achieve better safety capability on system level, for example, in retrofit cases, where a diagnostic feedback to the
safety system is required.
The feedback signal is not designed to be a part of the safety function, and it does not have a Safety Integrity Level.
l
Table 17: Instances of STO Feedback
State
Standard function
STO state is reached
Configuration needed
Software update
Danfoss A/S © 2024.08
Discrepancy time
(1)
Feedback state
De-energized
Energized
De-energized
De-energized
Functional Safety for Frequency Converters, Upgradable (+BEF2)
CAUTION
Additional information
The motor is running and no safety function is active. STO feed-
back is de-energized.
STO is requested, and safe state is reached.
STO state is reached and connection to all power units is estab-
lished. STO output is de-energized.
Safe inputs must have a validated configuration to ensure that all
power units have reached safe input state. The connected power
units are a part of the configuration, and without a validated con-
figuration, the safe input cannot assume to have a connection to
all power units established.
During software update, the state of the safe output is not reli-
able. STO output is de-energized.
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