Rockwell Automation Publication 1769-UM021G-EN-P - October 2015 249
Use I/O Modules with CompactLogix 5370 L3 Controllers Chapter 9
Local Bank
To validate the local bank design, confirm that the design meets these
requirements:
• The controller is the leftmost device in the local bank.
• No more than three modules are installed between the controller and the
left side of the power supply.
• No more than eight modules are installed to the right of the power supply.
• The power consumption of the modules on each side of the power supply
does not exceed the capacity of the power supply for that side.
• The total power consumption by all modules in the bank does not exceed
the capacity of the power supply for the entire bank.
• Modules are installed such that all power supply distance rating and system
power consumption requirements are met.
For example, the 1769-SDN scanner has a power supply distance rating of
four. If the design includes the installation of a 1769-SDN scanner with
greater than three modules between it and the power supply, the design is
invalid.
The following example graphic shows a local bank.
Regarding power supply distance ratings, if you install a module that violates
its power supply distance rating specification, the system can appear to
operate normally for a time, but could experience operational issues over time,
such as I/O faults.
1769-L33ER Controller
1769 Compact I/O
Power Supply
End Cap
Compact I/O Modules Compact I/O Modules
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