3 Hardware 02.2001
© Siemens AG 2001 All Rights Reserved
3
-30 SINUMERIK 840Di System Overview (SYI) - 02.2001 Edition
The I/O module PP 72/48
The I/O module PP72/48 is a simple and
cost-effective module for connecting digital
inputs/outputs to PROFIBUS-DP. The mod-
ule possesses the following features:
• PROFIBUS interface (max. 12 MBaud)
• 72 digital inputs
• 48 digital outputs
• On-Board status display
• 24V power supply
3.9 Uninterruptible power supply (UPS)
An uninterruptible power supply (UPS) is absolutely necessary if the SINUMERIK
840Di is generally switched off on the machine or on the automation system with-
out first shutting down Windows NT correctly. The Windows NT installation can be
damaged due to this procedure so that Windows NT will then no longer start up.
The UPS system will back up the supply voltage of the PCU for several minutes
and will report the power failure to Windows NT and/or to the PLC. The appropriate
functionality for the PLC user program is provided by Windows NT or the
PLC/SINUMERIK 840Di; now, the control system can be shut down correctly.
To create a suitable UPS system, e.g. the following components can be used:
• SITOP POWER DC UPS MODULE 15 (with/without RS 232)
• SITOP POWER LEAD-ACID BATTERY MODULE 24V DC / 10A / 3.2AH (op-
tion)
For detailed information on these and further UPS components, please refer to the
Catalog KT 10.1.
Fig. 3-13 I/O Module PP72/48
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