Allen-Bradley Compact GuardLogix 5370 User Manual page 94

Chapter 6 Add and Configure Standard I/O Modules
94
Local Bank
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 Compact I/O modules that are installed to the left of
the power supply in the local bank must be in a module slot that meets the
module's power supply distance rating requirements.
Additional Banks
Compact GuardLogix 5370 controller systems also support the use of extra
banks for the local expansion modules of the system. Every 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.
Most Compact I/O modules have power supply distance rating values that allow
you to install them in any slot on either side of the power supply in extra banks.
Some Compact I/O modules have power supply distance ratings that affect
where you can install them in the Compact GuardLogix 5370 controller system.
For example, the 1769-ASCII Compact ASCII and 1769-HSC Compact
high-speed counter modules each have a power supply distance rating of four.
These modules can be installed in local expansion module slots one through three.
In this case, you must install the 1769-ASCII module and 1769-HSC high-
speed counter module with no more three Compact I/O modules between the
module and the power, regardless of whether the modules are installed to the left
or right of the power supply.
Rockwell Automation Publication 1769-UM022C-EN-P - June 2018