Technical data

Rockwell Automation Publication 1769-TD005I-EN-P - August 2014 9
CompactLogix Controllers Specifications
You can use up to the maximum number of 1734 POINT I/O modules with the CompactLogix 5370 L1 controllers listed
in Ta b l e 4
, as long as the total current drawn by the embedded I/O and local expansion modules does not exceed both the
available POINTBus backplane current of 1 A and the field power current of 3 A.
Depending on your application’s configuration, you can use one of the following devices to make additional POINTBus
backplane current or field power current available:
• 1734-EP24DC POINT I/O Expansion Power Supply - An expansion power supply is installed between
embedded I/O modules and local expansion modules or between local expansion modules.
The expansion power supply breaks the available POINTBus backplane current between the modules to its left and
right. With the expansion power supply installed, the modules to its left can draw up to 1 A of POINTBus
backplane current and the modules to its right can draw as much current as that provided by the expansion power
supply.
Additionally, the expansion power supply breaks the available field power current between the modules to its left and
right. With the expansion power supply installed, the modules to its left can draw up to 3 A of field power current
and the modules to its right can draw as much field power current as allowed by the expansion power supply.
For more information on the 1734-EP24DC expansion power supply, see the POINT I/O 24V DC Expansion
Power Supply Installation Instructions, publication 1734-IN058
.
• 1734-FPD POINT I/O Field Power Distributor Module - A field power distributor module can also be installed
between embedded I/O modules and local expansion modules or between local expansion modules.
The field power distributor module breaks the available field power current between the modules to its left and
right. With the field power distributor module installed, the modules to its left can draw up 3 A of field power
current, and the modules to its right can draw as much field power current as allowed by the field power distributor.
For more information on the 1734-FPD POINT I/O Field Power Distributor module, see the POINT I/O Field
Power Distributor Module Installation Instructions, publication 1734-IN059
.
IMPORTANT
Remember, the field power distributor module changes only the level of field power current available in the system. The
module does not affect the level of POINTBus backplane current available.