Siemens NCU 7x0.3 PN Series Manual page 121

Maximum current consumption: 3 x 4 A if all outputs are used simultaneously.
CAUTION
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 V
DC) for the digital outputs must therefore be connected to all 4 pins per DOCOMx (X111,
X222, X333: pins 47, 48, 49, 50).
Analog inputs/outputs
The inputs and outputs are supplied with power on-board, i.e. no further external power
supply units are required.
Wiring the power supply
Table 9- 35
Pin
1
2
3
Current requirement
0.7 A (at 24 V DC) for PP 72/48D 2/2A 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).
The 24 V direct voltage is to be configured as an extra-low voltage with protective
separation - DVC A or PELV.
NCU 7x0.3 PN
Manual, 09/2011, 6FC5397-1EP40-0BA0
Pin assignment at X1 screw-type terminal block
Signal name
P24
M
PE
DANGER
Signal type Meaning
VI 24 V DC power supply
GND Ground
GND Protective ground
Connectable components
9.3 PP 72/48D 2/2A PN
121