Engel HFI2230-S200, Operating Manual

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STO – Safe Torque OFF
Functional description
Operating Manual Rev. 1.3 www.engelantriebe.de page 10
6.2 STO status signal
6.2.1 Functionality of the status signal and the status output
The status of the STO safety function is signalled via a potential-free semiconductor output. Only when the safety function
is activated the semiconductor output is closed, i.e. conductive.
The status output can be used to signal the status of the safety function to a higher-level control unit.
The status output has reverse polarity protection and is protected against overload and short circuit by a resettable fuse.
Channel1
V
STO1
Channel2
V
STO2
Status Output Note
0 … 5 V
(OFF)
0 … 5 V
(OFF)
closed / conductive
Both STO channels voltage-free, unsupplied:
STO active = safe state
24 V
(ON)
0 … 5 V
(OFF)
open / non-conductive
Invalid state:
STO channels inconsistently driven
0 … 5 V
(OFF)
24 V
(ON)
open / non-conductive
Invalid state:
STO channels inconsistently driven
24 V
(ON)
24 V
(ON)
open / non-conductive
Both STO channels supplied with voltage:
Safety function deactivated,
normal operation of the drive available
Figure 6-3: Circuit diagram of the status output