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Signal type
V
GND
Note
Digital and analog signals must not be laid together within a cable.
12.3.4.2
X1 power supply
Properties
This interface is intended exclusively for the connection of the external 24 V power supply.
On the module side, the power supplies are protected against:
• Polarity reversal
• Short-circuit (elec. current limitation of the outputs)
• Overload (self-restoring PTC fuse - Multifuse)
Requirements placed on the DC power supply
Inadequately fused supply cables can be life-threatening
In the case of supply lines > 10 m, protectors must be installed at the device input in order to
protect against lightning (surge).
The DC power supply must be connected to the ground/shield of the I/O module for EMC and/
or functional reasons. For EMC reasons, this connection should only be made at one point; see
also EMC Installation Guide.
Table 12-34
Rated voltage
Non-periodic overvoltages
NCU 1750
Equipment Manual, 01/2022, A5E45627807B AE
Meaning
Supply voltage
Protective ground (reference potential)
WARNING
Requirements of the DC power supply
According to EN 61131-2
Voltage range (average value)
Voltage range (dynamic)
Voltage ripple peak-to-peak
Ramp-up time at POWER ON
Duration of overvoltage
Recovery time
Events per hour
Connectable components
12.3 PP 72/48D PN 2/2A PN
24 VDC
20.4 VDC to 28.8 VDC
18.5 to 30.2 VDC
5% (unfiltered 6-pulse rectifi‐
cation)
Any
≤ 35 V
≤ 500 ms
≥ 50 s
≤ 10
135
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