Additional system components 
  9.1 Terminal Module TM54F 
SINAMICS S120 Combi 
Manual, 11/2017, 6SL3097-4AV00-0BP7 
199 
 
X531 fail-safe digital inputs + power supply with forced dormant error detection 
Table 9- 10  X531: Fail-safe digital inputs 
 
 
1  L 2+  Voltage: 24 VDC 
Maximum total load current: 500 mA 
(voltage is switched for a test stop) 
F-DI 5  Voltage: -3 … +30 VDC 
Electrical isolation: Yes 
Reference potential: see terminals 6, 7, 8 
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 6 
5  DI 13+ 
Reference potential to DI 11+ 
Reference potential to DI 13+ 
Reference potential to DI 10, DI 12, L2+ 
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 5 = terminals 2, 3 and 6 
F-DI 6 = terminals 4, 5 and 7 
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 5 to F-DI 9 can only be performed if the F-DI is supplied from L2+. 
 
Note 
Ensuring the function of digital inputs 
For the digital inputs DIx+ to function, the reference potential must be connected to input 
DIx
- 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