Power Supply Examples - Allen-Bradley 1734-IB8S Installation & User Manual

Chapter 5

Power Supply Examples

Power Supply Examples
60
• The 1734-EP24DC and 1734-EPAC power supplies provide two services.
– Breaks the field power distribution at the left of the power supply from
the field power distribution to the right of it
– Adds an additional 1.3 A of 5V current to the POINTBus backplane
for I/O modules to the right of the power supply
• Use the 1734-FPD field power distributor with the 5V bus. The 1734-
FPD field power distributor passes through all POINT I/O backplane
signals including the 5V bus supplied to the left, but does not provide
additional POINTBus backplane power. This lets you isolate field power
segments.
Consider these recommendations when using the POINT Guard I/O modules:
• With the GuardLogix controllers, use the 1734-AENT adapter.
• With the SmartGuard controller, use the 1734-PDN adapter.
The adapters and power supplies differ in their amount of power supplied to the
5V and/or 24V bus.
Refer to the POINT I/O Selection Guide, publication 1734-SG001, for more
information.
Use these valid power-supply example configurations to help you understand
various combinations of power supplies that may fit your system:
•
Example 1: POINT Guard I/O Used with 1734-EP24DC for Input,
1734-FPD for Output - 24V DC Only I/O on page 61
•
Example 2: POINT Guard I/O Used with 1734-EP24DC for Input and
Output, Plus AC I/O on page 62
These examples are for illustrative purposes only, to understand various power
sourcing concepts.
IMPORTANT
Rockwell Automation Publication 1734-UM013C-EN-P - August 2010
•
You must define the requirements for your application, for
segmenting field and bus power.
•
POINT Guard I/O does not require separate field-bus power usage,
that is, separate power supplies for the 1734-IB8S and 1734-OB8S
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.