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What is the difference between the M580 PAC BMEXBP backplane's two types of connectors, Ethernet and X Bus?

Title
Difference between the M580 PAC BMEXBP backplane's two types of connectors, Ethernet and X Bus
 
Issue
The difference between the M580 PAC BMEXBP backplane's two types of connectors, Ethernet and X Bus
 
Product Line
Modicon M580 PAC BMEXBP
 
Environment
Unity Pro 12
 
Cause
N/A
 
Resolution
The Modicon M580 PAC BMEXBP backplanes have two types of connectors, Ethernet and X Bus. 
The X Bus connection present on all M580 racks is used for to obtain and exchange the below type of data with the M580 CPU:
1.  Configuration data for the BMENOC03•1 module
2.  Application and diagnostic data

The BMEXBP backplane Ethernet connector is used for:
1. eX80 I/O modules, which require an Ethernet bus on the rack in order to exchange data (for example, X80 HART modules)
2. Communications to third-party modules that require Ethernet
3. Ethernet communication modules that interlink to the M580 CPU
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