142 Rockwell Automation Publication 1769-UM021G-EN-P - October 2015
Chapter 6 Communicate over Networks
Current Capacity in CompactLogix 5370 L3 Control Systems
In a local or extra bank, the modules that are installed on either side of the power
supply cannot draw more current than the power supply can supply. This
requirement partially dictates module placement on the bank.
For example, if a bank uses a 1769-PA2 Compact I/O power supply, each side of
the bank has a current capacity of 1A at 5V DC and 0.4A at 24V DC. Because a
1769-SDN scanner has a current draw of 440 mA at 5 V DC and 0 mA at 24 V
DC, you can only install up to two scanners on each side of the power supply in
the bank in this case.
For more information on 1769 Compact I/O power supply maximum current
capacity and calculations you can use to design the modules that are used in local
or extra banks, see Calculate System Power Consumption
on page 245.
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