6.8.5 Response to a discrepancy when Safe Direction is active (SDI)
Drive response
The inverter responds with the active SDI safety function to a discrepancy at the fail-safe digital
input.
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Figure 6-47 Response of the inverter for discrepancy of the input signal for SDI (SDI‑ as example)
The inverter does not set the error bit of the safety functions (= internal event).
After the tolerance time has expired, the inverter signals the discrepancy (Alarm C01770 or
C30770). The SDI function remains active, and the motor remains switched on.
Independent of the voltage levels available, the inverter sets the evaluation of the discrepant
fail-safe digital input into the safe state (= zero) until you acknowledge the inverter using a fail-
safe signal or you switch off the power supply voltage and switch it on again.
Inverter signals Parameters Included in the PROFI‐
safe telegram
Can be interconnec‐
ted with
F-DI F-DO
STO active (extended functions) r9722.0 ✓ --- ✓
SDI+ active r9722.12 ✓ --- ✓
SDI+ deselect r9720.12 ✓ ✓ ---
SDI- active r9722.13 ✓ --- ✓
Deselect SDI- r9720.13 ✓ ✓ ---
Operation
6.8 Safe Direction (SDI)
Safety Integrated - SINAMICS G110M, G120, G120C, G120D and SIMATIC ET 200pro FC-2
288 Function Manual, 01/2017, FW V4.7 SP6, A5E34261271B AD
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