SCALANCE XR-500 
Operating Instructions, 05/2017, A5E03275845-11 
55 
 
 
Commissioning devices and replacement devices 
If you use redundancy mechanisms (HRP/MRP ring redundancy and/or redundant coupling 
of rings with standby), open the redundant path before you insert a new or replacement 
device in an operational network. A bad configuration or attachment of the Ethernet cables 
to incorrectly configured ports causes overload in the network and a breakdown in 
communication. 
A device may only be inserted in a network and connected in the following situations: 
•  With HRP/MRP: 
–  Ring redundancy must be activated 
–  The mode must be selected correctly. 
–  The ring ports of the device being inserted in the HRP/MRP ring must be configured 
as ring ports. 
•  With standby link: 
–  The standby connection must be activated. 
–  The "Standby Connection Name" must match the name of the partner device. 
–  The port must be configured as a standby port. 
For further information, refer to the configuration manuals (Page 5).