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Examples of F-DQ components: • SIMATIC ET 200MP F-DQ 8x24VDC/2A PPM
• SIRIUS 3SK1
Figure7-25 Connection of a sourcing/sourcing failsafe digital output
7.2.10 Connection options for the fail-safe digital output
Requirement
A power supply is required at X124 to operate the failsafe digital output.
WARNING
Deactivated safety function after cross circuit of relay connecting cables
If there is a relay connected at the sourcing output and the sinking output, there can be a
voltage at the relay due to a cross circuit between F-DO 0+ and F-DO 0- even when the failsafe
digital output is switched o. This can result in the relays remaining switched on and the
associated safety function being deactivated. A deactivated safety function leads to hazardous
operating states that can cause personal injury and damage to property.
• Route the relay connecting cables to prevent cross circuits, forexample using separately
sheathed cables or separate cable ducts.
Connecting
7.2Interfaces for the controller
SINAMICS G220 converter
186 Operating Instructions, 04/2024, FW V6.2, A5E51781573B AB
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