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What is the difference between a M580 Main IP Address and IP Address A (&B) ?

Published date: 04 January 2019

Title
M580 Main IP Address and IP Address A (&B)
 
Issue
M580 Main IP Address and IP Address A (&B)
 
Product Line
Control Expert, Unity Pro, M580 PAC
  
Resolution
For the M580, the Main IP Address is the address of the CPU and the IP Address A (& B) is the IP address of the EIO scanner service (IP address B – used for Hot Standby).
NOTE: If you change IP address A, the system may recalculate all IP addresses (including those of the drops) to keep all devices in the same subnetwork.

For the M580 Hot Standby, the Main IP address will always be assigned to the Primary PAC and the Main IP +1 will be the Standby PAC, this is an automatic switchover. The A and B IP addresses however will always be assigned to the A and B specific hardware (switch setting), they do not change on switchover

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