SD39RIO-1 INSTALLATION
January 2001
2-37
Figure 2-26 Bottom View of Rack Showing Built-in Recirculating Fans
2.9 DC Power Bus Connections
Triplicate power buses supply 24 Vdc operating power to the rack’s I/O modules from up to three
independent power sources. Power is applied to each of the power bus connectors by a user-installed cable
from either an externally mounted power supply, such as a Siemens Moore POWERAC, or a user-supplied
power supply. The power bus connectors are located on the left side of the Remote I/O Rack’s backplane and
are identified as P1 (24V A), P2 (24V B), and P3 (24V C) as shown in Figure 2-4. Power bus connector
pinouts are shown in Figure 2-27. A power supply cable (P/N 16137-60) compatible with the Remote I/O
Rack and POWERAC (and other power supplies) is available from Siemens Moore (Figure 2-28). One cable
is required for each power supply.
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