Rockwell Automation Publication 1769-UM021I-EN-P - May 2018 137
Communicate over Networks Chapter 6
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 emb edded 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 7
describes the farthest local expansion module slot where you can install
a 1769-SDN scanner and meet its power supply distance rating requirement.
Table 7 - Example CompactLogix 5370 L2 Control Systems with a 1769-SDN Scanner
Controller Cat. No. Number of Embedded
I/O Modules
1769-SDN Scanner Power Supply Distance Rating Calculation Impact
1769-L24ER-QB1B 1 The embedded I/O module is the first module in the module count. At its maximum power supply distance rating, the
1769-SDN scanner can be installed in slot 3 of the local expansion modules, as shown in the following graphic.
Three modules between the power supply and the 1769-SDN scanner. With this controller catalog number, you can only
install up to two local expansion modules between the controller and the 1769-SDN scanner.
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