ABB REF 54 Series Technical Reference Manual page 41

1MRS750527-MUM

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Technical Reference Manual, General
The example below shows how the attributes of the digital input 1 (PS1_4_BI1 on
PS1 module) of the feeder terminal REF 541 are named for the configuration:
PS1_4_BI1IV; digital input invalidity
PS1_4_BI1; digital input value
PS1_4_BI1Time; time tag
PS1_4_BT1Count; counter value
,QYDOLGLW\ %, ,9
When a digital input oscillates, the invalidity attribute IV changes to TRUE (1) and
the input is blocked. The digital input is regarded as being blocked and oscillating if
the number of status changes per second exceeds the set "Input osc. level" value
(events/s).
When a digital input does not oscillate, the invalidity attribute IV changes to FALSE
(0) and the input becomes operative. The digital input is regarded as being operative
and non-oscillating if the number of status changes per second is less than the set
"Input osc. level" value minus the set "Input osc. hyst." value (events/s).
9DOXH %,
Depending on the status 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 status changes of the digital input due to e.g. switch debouncing,
the change of the attribute value is delayed by the filter time.
The counter attribute of a digital input is not updated when the input is programmed
as a normal digital input.
7LPH %, 7LPH
Each change (rising or falling edge) detected in the status 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 status change has elapsed, which means that the filtering time does not
affect the time tag value.
&RXQW %, &RXQW
The count attribute indicates the number of positive input transitions of a filtered
input.
'LJLWDO RXWSXWV
The outputs of the REF 54_ feeder terminal are categorized as follows:
HSPO High-speed power output, double-pole contact, preferred for tripping
purposes and for circuit breaker and disconnector control
PO Power output, either single-pole or double-pole contact, preferred for
circuit breaker and disconnector control
SO Signal output, either NO (Normally Open) or NO/NC (Normally Open/
Normally Closed) contact
5() B
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