220 Rockwell Automation Publication 1769-UM021I-EN-P - May 2018
Chapter 8 Use I/O Modules with CompactLogix 5370 L2 Controllers
Power Supply Distance Rating
In a CompactLogix 5370 L2 control system, you can install Compact I/O
modules on as local expansion modules to the right of the controller system.
Compact I/O modules each have a power supply distance rating that you must
consider before you install them.
Power supply distance rating is the number of slots a Compact I/O module can
be installed away from the power supply. If a Compact I/O module has a
distance rating of three, you can include up to two modules between the
Compact I/O module and the power supply.
Additionally, the controller has embedded I/O modules that are designed to
protect against installation of a Compact I/O module directly to the right of
the embedded power supply. CompactLogix 5370 L2 control systems have
embedded I/O modules in the controller. CompactLogix 5370 L2 control
systems have one or two embedded I/O modules as 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
The embedded I/O modules are not considered local expansion modules.
However, you must still include each embedded I/O module in the module
slot count when determining where to install Compact I/O module as a local
expansion module.
Because CompactLogix 5370 L2 control systems only allow up to four local
expansion modules in the system, you can install most Compact I/O modules
in any local expansion module slot. Some Compact I/O modules have power
supply distance ratings that affect where you can install them in the
CompactLogix 5370 L2 control system.
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