Siemens SINUMERIK 840D sl Manual page 120

Connectable components
9.3 PP 72/48D 2/2A PN
Transient voltage interruptions Outage time
Digital inputs
The 24 V supplied at X1 are used to supply the 72 digital inputs.
If the internal supply voltage is not used to supply the digital inputs, this can optionally be
replaced by an external power supply (24 V DC). The reference ground of the power supply
source must each be connected with X111, X222, X333, pin 1 (GND). X111, X222, X333, pin
2 (P24OUT) then remains open.
Digital outputs
To supply (24 V DC) the digital outputs, an additional external power supply source is required.
The power supply is connected to terminals X111, X222 and X333 via pins 47, 48, 49 and 50
(DOCOMx). Ground pins must be connected to a common chassis ground.
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 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.
120
Recovery time
Events per hour
Recovery time
Events per hour
Pin assignment at X1 screw-type terminal block
Signal name Signal type
P24 VI
M GND
PE GND
Meaning
24 V DC power supply
Ground
Protective ground
Manual, 06/2014, 6FC5397-1EP40-5BA1
≥ 50 s
≤ 10
≤ 3 ms
≥ 10 s
≤ 10
NCU 7x0.3 PN, NCU 7x0.3B PN