ABB RET 54 Series Technical Reference Manual, General page 46

RET 54_ Transformer Terminal
1MRS755225
Technical Reference Manual, General
Value (BI#)
Depending on the state of the digital input, the digital input value is TRUE (1) or
FALSE (0). The BI# value changes on the rising or falling edge of the input. To
prevent undesired state changes of the digital input due to e.g. switch debouncing,
the change of the attribute value is delayed by the filter time.
The value attribute of the digital input is not updated when the input is programmed
as counter digital input.
Time (BI#Time)
Each change (rising or falling edge) detected in the state of a digital input is time-
tagged at an accuracy of ±1 ms. The time tag represents the moment (time) of the
latest input change of the value attribute. The time is not recorded until the filtering
time of the state change has elapsed, which means that the filtering time does not
affect the time tag value.
Count (BI#Count)
The count attribute indicates the number of positive input transitions of a filtered
input. Refer to section "Pulse counters" on page 45.
The counter attribute of a digital input is not updated when the input is programmed
as a normal digital input.
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