ABB Relion 670 Series Commissioning Manual page 60

Section 8
Establishing connection and verifying the IEC 61850 communication
one of the Ethernet ports. Verify that either signal status (depending on which connection that was
removed) is shown as Error and the that other signal is shown as Ok. Be sure to re-connect the
removed connection after completed verification.
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1MRK 506 377-UEN Rev. K
Railway application RER670
Commissioning manual