ABB Protect IT REL 501 2.5 Series Operator's Manual page 73

Distance protection terminal
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66
View the I/O function block signals
7DEOH  2XWSXW VLJQDOV IRU WKH ELQDU\ VLJQDO WUDQVIHU WR UHPRWH HQG IXQFWLRQ
57&Q ZKHUH Q
6LJQDO
REC01-REC16
COMFAIL

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Binary signals received from remote terminal, outputs 01-16
Communication failure
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