Rockwell Automation Publication 1769-UM021G-EN-P - October 2015 141
Communicate over Networks Chapter 6
CompactLogix 5370 L3 Control Systems
CompactLogix 5370 L3 control systems do not have embedded I/O modules.
You begin counting local expansion slots with the first Compact I/O module
installed next to the power supply when determining where to install a 1769-
SDN scanner and meet its power supply distance rating.
In CompactLogix 5370 L3 control systems, you can install 1769-SDN scanners
to the left or right side of the power supply. You can also use local and extra banks
in CompactLogix 5370 L3 control systems, with each allowing the inclusion of a
1769-SDN scanner.
In the local bank, the controller must be the leftmost device in the system and
you can only install up to three modules between the controller and the power
supply. Therefore, any 1769-SDN scanners that are installed to the left of the
power supply in the local bank, are in a module slot that meets the power supply
distance rating requirements of the module.
CompactLogix 5370 L3 control systems also support the use of extra banks for
the local expansion modules of the system. Each additional bank requires a 1769
Compact I/O power supply. The bank can be designed with local expansion
modules on either side of the power supply.
In this case, you must install the 1769-SDN scanner with no more three
Compact I/O modules between the scanner and the power, regardless of whether
the modules are installed to the left or right of the power supply.
This graphic shows 1769-SDN scanners that are installed in a 1769-L36ERM
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