Siemens SINUMERIK ONE NCU 1740 Equipment Manual page 116

Connectable components
12.2 PP 72/48D PN
Maximum current consumption: 3 x 4 A if all outputs are used simultaneously.
Note
It is the user's responsibility to ensure that the max. current consumption per DOCOMx pin
(X111, X222, X333: Pins 47, 48, 49, 50) does not exceed 1 A. The power supply (+24 VDC) for
the digital outputs must therefore be connected to all 4 pins per DOCOMx (X111, X222, X333:
pins 47, 48, 49, 50).
Wiring the power supply
Table 12-14
Pin
1
2
3
Current requirement
0.7 A (at 24 VDC) for PP 72/48D PN and digital inputs plus 3 x 4 A at X111, X222 and X333 for
supplying digital outputs.
Wiring the screw-type terminal block
The required 24 VDC load power supply is wired to the screw-type terminal block (X1).
Danger of death caused by unsafe power supply
The 24 V direct voltage is to be configured as an extra-low voltage with protective separation
- DVC A or PELV according to EN 61800-5-1.
Power cables
Table 12-15
Characteristics
Connection option
Current carrying capacity
Max. cable length
Use flexible cables with a cross-section of 0.25 to 2.5 mm
power supply according to the maximum current that flows.
If you only use one wire per connection, an end sleeve is not required.
You can use end sleeves without an insulating collar according to DIN 46228/1.
116
Pin assignment at X1 screw-type terminal block
Signal name
P24
M
PE
DANGER
Cable specification at X1
Signal type Meaning
VI 24 V DC power supply
GND Ground
GND Protective ground
Version
Up to 2.5 mm
max. 10 A
10 m
2
(or AWG 23 to AWG 13) for wiring the
2
Equipment Manual, 10/2021, A5E51087503B AA
NCU 1740