Attributes Of A Digital Input For Transformer Terminal; Configuration - ABB RET 54 Series Technical Reference Manual, General

1MRS755225
5.1.7.5.
Transformer Terminal
Technical Reference Manual, General
(Oscillation level). During oscillation, the digital input is blocked (the status is
invalid) and an event is generated. The state of the input will not change when it is
blocked, i.e. its state depends on the condition before blocking.
The digital input is regarded as non-oscillating if the number of valid state changes
during 1 second is less than the set value of "Input osc. level" minus the set value of
"Input osc. hyst." (Oscillation hysteresis). Note that the oscillation hysteresis must
be set lower than the oscillation level to enable the input to be restored from
oscillation. When the input returns to a non-oscillating state, the digital input is
deblocked (the status is valid) and an event is generated.
Parameter
Input osc. level 2...50 events/s
Input osc. hyst. 2...50 events/s
Unlike most parameters for digital I/O cards, the parameters "Input osc.
level" and "Input osc. hyst." can be found in the menu
Configuration/General.

Attributes of a digital input for transformer terminal

configuration

The validity of the digital input (invalidity), the state of the input (value), the time
tag for the state change (time) and the counter value of the input can be issued for
each digital input by the attributes BI#IV, BI#, BI#Time and BI#Count, where #
denotes the number of the input. These attributes are available in the transformer
terminal configuration and can be used for different purposes.
The example below shows how the attributes of the digital input 1 (PS1_4_BI1 on
PS1 module) of the transformer terminal RET 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
Invalidity (BI#IV)
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 state 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 state changes per second is less than the set
"Input osc. level" value minus the set "Input osc. hyst." value (events/s).
If the digital input is used in counter mode, IV is always TRUE (1).
Values Default
50 events/s
10 events/s
RET 54_
45