Siemens Sinamics S110 Function Manual page 330

Safety Integrated Functions
8.5 Extended Functions
F-DI/F-DO forced dormant error detection
For forced dormant error detection of the F-DIs, the level of the F-DIs must be inverted, e.g.
by activating the appropriate switch or triggering the appropriate function in the connected
safety control. The correct reaction to the level change on the F-DIs must be observed by the
person carrying out the operation.
If the F-DO is used, it must undergo forced dormant error detection by triggering the
appropriate functions in the drive and the resulting level changes on the F-DO.
The correct function of the F-DO must be checked by whoever carries out forced dormant
error detection. The required format of the check is determined by the F-DO interconnection.
● F-DO at an F-DI of a safety relay
a safety relay with CU305)
⇒ In the case of dormant error detection for the F-DO, its two output drivers are checked
by the F-DI of the connected safety relay to ensure that they are functioning correctly.
● F-DO at two contactors with positively driven auxiliary contacts
● When connecting other loads, remember that the correct function of the two output
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(as illustrated in the section titled "Application examples/Input/output interconnections for
(see the section titled Application examples/Interconnection of F-DO with redundant
contactors)
⇒ The feedback contacts of both contactors have to be monitored by a controller or
another monitoring unit to ensure that they both close when the F-DO is switched off (see
Application examples).
drivers has to be monitored separately where forced dormant error detection is
concerned.
Function Manual, 10/2008, 6SL3097-4AB10-0BP0
Drive functions