Additional system components 
  9.1 Terminal Module TM54F 
SINAMICS S120 Combi 
Manual, 11/2017, 6SL3097-4AV00-0BP7 
195 
 
X522 fail-safe digital inputs 
Table 9- 6  X522: Fail-safe digital inputs 
 
 
F-DI 2  Voltage: -3 … +30 VDC 
Electrical isolation: Yes 
Reference potential: see terminals 7, 8, 9, 10 
Input characteristic acc. to IEC 61131-2, type 1 
Input voltage (including ripple) 
 "1" signal: 15 … 30 V 
 "0" signal: -3 … +5 V 
Input current 
 at 24 VDC: Typical 3.2 mA 
 for "1" signal: > 0.5 mA 
Input delay:
2)
 
 for "0" → "1": Typical 30 μs 
 for "1" → "0": Typical 60 μs 
Switching frequency: Maximum 100 Hz 
F-DI 3 
4  DI 7+ 
F-DI 4 
6  DI 9+ 
Reference potential for DI 5+ 
Reference potential for DI 7+ 
Reference potential for DI 9+ 
Reference potential for DI 4, DI 6 and DI 8 
An F-DI consists of a digital input and a 2nd digital input where, in addition, the cathode of the optocoupler is fed-out. 
F-DI 2 = terminals 1, 2 and 7 
F-DI 3 = terminals 3, 4 and 8 
F-DI 4 = terminals 5, 6 and 9 
Type: Screw terminal 1 (Page 288) 
  DI: Digital input, F-DI: Fail-safe digital input 
 
 
Note 
Execution of a test stop 
The test stop of the F
-DI 0 to F-DI 4 can only be performed if the F-DI is supplied from L1+. 
 
Note 
Ensuring the function of digital inputs 
For the digital inputs DIx+ to function, the refere
nce potential must be connected to input 
- in each case. 
This is achieved by using one of the following measures:
 
  Providing the ground reference of the digital inputs 
  A jumper between DIx- and terminal M1