Rockwell Automation Publication 5069-UM007A-EN-P - February 2019 17
Compact 5000 EtherNet/IP Adapter Power Requirements Chapter 2
• We recommend that you use an external power supply that is adequately
sized for the total SA power bus current draw.
For example, if the total SA power current draw is 4 A, you can use an
SA power supply that is limited to 4 A.
You must consider current inrush requirements when you calculate the
total SA power bus current draw.
• Connections to an SA power bus use a shared common. All inputs that
draw current from an SA power bus to power field-side devices have a
return through circuitry to the SA - terminal on the SA power
connector.
When the SA power source is turned on, that is, the adapter and I/O modules
receive field-side power, the following occurs.
1. The Compact 5000 I/O EtherNet/IP adapter draws current from the
SA power bus current and passes the remaining current through to the
next module.
2. The next module completes one of the following tasks.
– If the module uses SA power to power a field-side device, the module
draws current from the SA power bus and passes the remaining
current through to the next module.
– If the module does not use SA power bus current, the module passes
the remaining current through to the next module.
3. The process continues until all SA power bus current needs are met for
the modules on the SA power bus.
For more information on the current that the 5069 Compact I/O™ modules
draw from the SA power bus, see the 5069 Compact I/O Modules
Specifications Technical Data, publication 5069-TD001
.
IMPORTANT Each SA power bus has a shared common unique to that bus
because SA power buses are isolated from each other.
That is, the SA power bus that the adapter establishes has a shared
common. If you use a 5069-FPD field potential distributor to
establish a new SA power bus in the system, the second bus has its
own shared common for modules that draw current from it.
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