138 Rockwell Automation Publication 1769-UM021G-EN-P - October 2015
Chapter 6 Communicate over Networks
Power Supply Distance Rating
CompactLogix 5370 L2 and L3 control systems enable you to install 1769-SDN
scanners as local expansion modules. The 1769-SDN scanner has a power supply
distance rating that you must consider before installing it.
Power supply distance rating is the number of slots a 1769-SDN scanner can be
installed away from the power supply. The 1769-SDN scanner has a power supply
distance rating of four. Therefore, your CompactLogix 5370 L2 or L3 control
system can include up to three modules between the 1769-SDN scanner and the
power supply.
The power supply distance rating of the 1769-SDN scanner as a design
consideration differs by CompactLogix L2 controller catalog number.
CompactLogix 5370 L2 Control Systems
In a CompactLogix 5370 L2 control system, you can install a 1769-SDN scanner
on the right side of the control system. The controller has an embedded power
supply, which disallows the installation of 1769-SDN scanners between the
controller and the power supply.
Additionally, the controller has embedded I/O modules that disallow installation
of the 1769-SDN scanner directly to the right of the embedded power supply.
CompactLogix 5370 L2 control systems have one or two embedded I/O
modules, described as follows:
• 1769-L24ER-QB1B controller - One embedded I/O module
• 1769-L24ER-QBFC1B and 1769-L27ERM-QBFC1B controllers - Two
embedded I/O modules
While the embedded I/O modules are not considered local expansion modules,
you must still include each embedded I/O module in the module slot count when
determining where to install the 1769-SDN scanner as a local expansion module.
The farthest local expansion module slot where you can install the 1769-SDN
scanner in a CompactLogix 5370 L2 control system is module slot number two
or three as determined by the controller catalog number that is used in the
control system.
Tab le 6
describes the farthest local expansion module slot where you can install a
1769-SDN scanner and meet its power supply distance rating requirement.
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