46 Rockwell Automation Publication 1734-UM013J-EN-P - July 2014
Chapter 3 Guidelines for Placing Power Supplies and Modules in a System
Choose from these power supplies for the POINTBus backplane and field
power:
• Use the 1734-EP24DC expansion power supply to provide an additional
10 A of 24V DC field power and provide an additional 1.3 A of 5V current
to the I/O modules to the right of the power supply.
• Use the 1734-FPD field power distributor to provide an additional 10 A of
24V DC field power, and to pass through all POINT I/O backplane
signals including the 5V bus supplied to the left, without providing
additional POINTBus backplane power. This lets you isolate field power
segments.
• Use the 1734-EPAC expansion power supply (for standard I/O modules)
to provide an additional 10 A of 120/240V AC field power and provide an
additional 1.3 A of 5V current to the I/O modules to the right of the
power supply.
Refer to the POINT I/O Selection Guide, publication 17
34-SG001, for more
information on compatible power supplies.
Power Supply Examples
Use these valid power-supply example configurations to help you understand
various combinations of power supplies that may fit your system:
• Example 1: Isolating Field Power Segments
on page 47
• Example 2: POINT Guard I/O Used with AC I/O Modules on page 47
These examples are for illustrative purposes only, to help you understand various
power sourcing concepts.
If you use the 1734-EPAC expansion power supply to the left of the POINT
Guard I/O modules, you must use a 1734-FPD field power distributor or
1734-EP24DC expansion power supply to isolate POINT Guard I/O field power
from the AC field supply.
Establishing and maintaining communication (connection) between the
module and the controller requires 5V POINTBus power.
• You must define the requirements for segmenting field and bus power in
your application.
• POINT Guard I/O does not require separate field-bus power usage, that is,
separate power supplies for the 1734-IB8S, 1734-OB8S, or 1734-IE4S
modules. This is optional.
• POINT Guard I/O does not require separate POINTBus (communication)
power-supply usage, separating it from any other POINT I/O modules,
except when additional POINTBus power is required.
• Do not apply AC voltage to POINT Guard I/O modules.
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