ABB RELION 670 Series Applications Manual page 262

Section 18
Station communication
ANSI13000298 V1 EN-US
Figure 95: Normal operation
Case 2:
Failure of the MU (sample lost) blocks the sending of binary signals through LDCM. The received
binary signals are not blocked and processd normally.
→DTT from the remote end is still processed.
ANSI13000299 V1 EN-US
Figure 96: MU failed, mixed system
Case 3:
Failure of one MU (sample lost) blocks the sending and receiving of binary signals through LDCM.
→DTT from the remote end is not working.
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ANSI13000299-1-en.vsd
1MRK 511 364-UUS A
Application manual