01/2007
2.11 I/O module PP72/48
2-88
© Siemens AG 2007 All Rights Reserved
SINUMERIK 840Di sl Manual (HBIsl) – 01/2007 Edition
Table 2-21 Specification of the power 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–cyclic overvoltage
Max. (absolute, transient) 35 V
Max. duration 500 ms
Min. recovery time 50 s
Max. events per h 10
Voltage failure for min. power supply voltage
Max. duration
1)
50 ms
Min. recovery time 1 s
Max. events per h 10
Power consumption
Maximum approx. 40 W
On the module side the power supplies must be protected against:
S Polarity reversal
S Short–circuit (elec. current limitation of the outputs)
S Overload (fuse protection).
2.11.4 Grounding
The module must be installed according to EN 60204.
If a large–area, permanent metallic connection with the central ground point
through the rear panel is not possible, the mounting plate must be connected to
the grounding by means of a line (cross section >10 mm
2
).
!
Caution
A protective conductor must be connected.
2 Hardware Descri
tions
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