ABB RELION 670 Series Technical Manual page 1138

Section 18
Station communication
transformers, non-conventional transducers or both. The gathered data are then transmitted to
subscribers over the process bus, utilizing the IEC 61850-9-2LE protocol.
The IED communicates with the MUs over the process bus via the OEM module port "CD". For the
user, the MU appears in the IED as a normal analogue input module and is engineered in the very
same way.
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1MRK 502 066-UUS B
Technical manual