Siemens SINAMICS G220 - Page 705

Description of function
Various modes are available for the self-test of a fail-safe digital output (F-DO):
• Diagnostics using internal feedback signals: p10047 = 0
The self-test continuously monitors the activation and feedback, and detects errors in the
output circuit.
• Self-test using internally speci󹪝ed dark pulses: p10047 = 1
The self-test continuously monitors the activation and feedback, and detects errors in the
output circuit. The converter also outputs dark pulses as soon as the fail-safe digital output
is in the High state.
The dark pulses at the output terminals reveal errors outside the converter.
P10020 determines the length of the dark pulse. The test cycle of the dark pulses has a 󹪝xed
value of 5seconds.
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Figure14-249 Dark pulses
Parameters
The following list contains the parameters of the "Self-test of the fail-safe digital output"
function.
Number Name Unit
p10020 SI F-DO self test dark pulses duration [ms]
p10047 SI F-DO diagnostics mode selection 
r10072.0 SI F-DO status 
Functions
14.12Safety Integrated
SINAMICS G220 converter
Operating Instructions, 04/2024, FW V6.2, A5E51781573B AB 703