Siemens SINAMICS S150 Operating Instructions Manual page 63

Note
The digital inputs (terminals -X520 and -X530) in the example are powered by the internal 24
V supply of the customer terminal block (terminal -X540).
The two groups of digital inputs (optocoupler inputs) have a common reference potential
(ground reference M1 or M2). In order to close the circuit when the internal 24 V supply is
used, the ground references M1 / M2 must be connected to internal ground (M).
If power is not supplied from the internal 24 V supply (terminal -X540), the jumper between
ground M1 and M or M2 and M must be removed in order to avoid potential rounding. The
external ground must then be connected to terminals M1 and M2.
X520: 4 digital inputs
Table 4-10 Terminal block X520
Terminal
1
2
3
4
5
6
DI: digital input; M1: ground reference; M: Electronics ground
1)
Max. connectable cross-section: 1,5 mm² (AWG 14)
Note
An open input is interpreted as "low".
To enable the digital inputs to function, terminal M1 must be connected. The following
options are available:
1. The provided ground reference of the digital inputs, or
2. a jumper to terminal M (notice: this removes isolation for these digital inputs).
Drive converter cabinet units
Operating Instructions, 07/07, A5E00288214A
Designation
1)
DI 0 Voltage: - 3 V to 30 V
Current input (typical): 10 mA up to 24 V
DI 1
With electrical isolation: reference potential is terminal M1
DI 2
Level:
DI 3
- High signal level: 15 V to 30 V
M1
- Low signal level: -3 V to 5 V
M
Technical specifications
Electrical installation
4.8 Signal connections
63