01/2007
2.11 I/O module PP72/48
2-87
© Siemens AG 2007 All Rights Reserved
SINUMERIK 840Di sl Manual (HBIsl) – 01/2007 Edition
The module has 3 LEDs through which the module status is displayed.
Table 2-20 LED: Status display
Designation
Color Description
POWER Green Power supply
OVTEMP Red Overtemperature indication
EXCHANGE Green Cycl. data exchange with DP master in progress
READY Red Ready for cycl. data exchange with DP master
2.11.3 Power supply
The supply voltage (24 V DC) of the I/O module PP72/48 is connected to the
screw terminal block X1. See Subsection 2.11.2, Page 2-80.
To power the digital outputs (+24 V DC), an external power supply source is
required. The power supply is connected through terminals X111, X222, X333,
pins 47, 48, 49, 50 (DOCOMx).
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.
The external power supply voltages must be generated as functional extra–low
voltages with safe electrical isolation (according to IEC 204–1, Section 6.4,
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 2-21.
LED: Status display
Module
Digital outputs
Digital inputs
Specification of
the power supply
voltages (+24 V
DC)
2 Hardware Descri
tions
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