158 Rockwell Automation Publication 1769-UM021I-EN-P - May 2018
Chapter 7 Use I/O Modules with CompactLogix 5370 L1 Controllers
• You can use up to the maximum number of 1734 POINT I/O modules
with the CompactLogix 5370 L1 controllers that are listed in Tab le 8
.
This condition applies only as long as the total current drawn by the
embedded I/O and local expansion modules does not exceed the
available POINTBus backplane current of 1 A and field power current
of 3 A.
Based on the configuration of your application, you can use one of the
following devices to make more 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. The modules to the right of
the expansion power supply can draw as much current as is 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. The modules to the right of the
expansion power supply can draw as much field power current as
allowed by the expansion power supply.
For example, if you need six 1734-IR2 modules as local expansion
modules for a 1769-L18ER-BB1B controller application, you must
include the 1734-EP24DC expansion power supply in the local
expansion-module installation.
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
.
IMPORTANT Do not put more than three of the 1734-IT2I or 1734-IR2 modules
on the POINT I/O bus that draws power from the same power source.
This restriction includes power sources such as from communication
adapters or the 1734-EPAC or 1734-EP24DC expansion power supply
modules. The inrush current exceeds the current limit of the DC to
DC converter in the power source.
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