Requirements placed on the DC power supply
WARNING
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 9-13 Requirements of the DC power supply
Rated voltage According to EN 61131-2 24 V DC
Voltage range (average value) 20.4 V DC to 28.8 V DC
Voltage range (dynamic) 18.5 to 30.2 V DC
Voltage ripple peak-to-peak 5% (unltered 6-pulse recti‐
cation)
Booting time at POWER ON Any
Non-periodic overvoltages ≤ 35 V
Duration of overvoltage ≤ 500 ms
Recovery time ≥ 50 s
Events per hour ≤ 10
Transient voltage interrup‐
tions
Outage time ≤ 3 ms
Recovery time ≥ 10 s
Events per hour ≤ 10
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.
Connectable components
9.2 PP 72/48D PN
NCU 7x0.3B PN
Equipment Manual, 10/2020, 6FC5397-1EP40-6BA1 105
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