Siemens SINUMERIK 840Di Manual page 101

06.03
LED: Status display
2.12.3 Power supply
ADI4 module
Digital outputs
Digital inputs
Specification of
the power supply
voltages (+24VDC)
 Siemens AG, 2003. All rights reserved
SINUMERIK 840Di Manual (HBI) – 06.03 Edition
The module has three LEDs through which the module status is displayed.
Table 2-22 LED: Status display
Designation Color
POWER green
OVTEMP red
EXCHANGE green
READY red
The supply voltage (24VDC) of the I/O module PP72/48 is connected to the
screw terminal block X1. See Subsection 2.12.2, page 2-94.
To power the ADI4 module (+24VDC), an external power supply source is
required. The power supply is connected through the screw terminal block X1.
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).
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 (+24VDC) 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.
2.12 I/O Module PP72/48
Description
Supply voltage
Overtemperature display
Cyclic data exchange with DP master in prog-
ress
Ready for cyclic data exchange with DP mas-
ter
2 Hardware Descriptions
2-101