Hardware Descriptions
2.12 PP72/48 I/O module
Manual
100
Commissioning Manual, 05/2008, 6FC5397–4CP10–4BA0
2.12.3
Power supply
Assembly
The supply voltage (24 V DC) of the I/O module PP72/48 is connected to the screw terminal
block X1. Refer to Section "Interface description" (Page 92)
Digital outputs
To power the digital outputs (+24VDC), an external power supply source is required. The
power supply is connected through terminals X111, X222, X333, pins 47, 48, 49, 50
(DOCOMx).
Digital inputs
If the internal power supply from X111, X222, X333, Pin 2 (P24OUT) is not used to power
the digital inputs, it can be replaced by an external power supply source (+24 V DC) as an
option.
The reference ground of the power supply source must be connected with X111, X222, X333,
Pin 1 (GND). X111, X222, X333, Pin 2 (P24OUT) then remains open.
Specification of the supply voltages (+24V DC)
The external power supply voltages must be generated as functional extra-low voltages with
safe electrical isolation (according to IEC 204-1, PELV) and must be grounded centrally by
the user.
The reference ground of the terminals X111, X222, X333, pin 1 (GND) must be connected to
a common grounding point with the reference ground of the power supply of the I/O module
PP27/48.
CAUTION
The external power supply voltages must be generated as function extra-low voltages with
safe electrical isolation (IEC 204-1, Section 6.4, PELV) and must be grounded centrally by
the user.
Moreover, the external power supply voltages for the I/O modules PP72/48, the digital
outputs, and optionally the digital inputs must meet the specifications according to Table.
Table 2-21 Specification of the supply voltage P24OUT
Voltage
Minimum
20.4 V
Nominal
24 V
Maximum
28.8 V
minimum (dynamic)
18.5 V
maximum (dynamic)
30.2 V
Non-periodic overvoltage
