ABB REG670 Technical Manual page 751

1MRK502052-UEN B
Technical manual
Via coded binary (Binary), binary coded decimal (BCD) signals or Gray coded
binary signals
The Tap changer control and supervision, (TCMYLTC or TCLYLTC) decodes binary
data from up to six binary inputs to an integer value. The input pattern may be decoded
either as BIN, BCD or GRAY format depending on the setting of the parameter
CodeType.
It is also possible to use even parity check of the input binary signal. Whether the
parity check shall be used or not is set with the setting parameter UseParity.
The input BIERR on (TCMYLTC or TCLYLTC) can be used as supervisory input for
indication of any external error ( Binary Input Module) in the system for reading of tap
changer position. Likewise, the input OUTERR can be used as a supervisory of the
Binary Input Module.
The truth table (see table 426) shows the conversion for Binary, Binary Coded
Decimal, and Gray coded signals.
Section 14
Control
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