Oscillation Suppression - ABB REF 54 Series Technical Reference Manual, General

REF 54_
5.1.7.4.
46
Feeder Terminal
Technical Reference Manual, General
Writing the value 2 to the "Counter trigger" parameter copies all the "Input # preset"
values to the corresponding "Input # counter" parameters. Writing the value 0 clears
all the counters.
Parameter Values
Input # preset 0..... 2147483647
Input # mode 1 = digital input
2 = counter
Counter trigger 0 = clear all counters
1 = load updated Input # preset values
2 = load all Input # preset values

Oscillation suppression

Oscillation suppression is used to reduce the load from the system when, for some
unrecognized reason, a digital input starts oscillating. A digital input is regarded as
oscillating if the number of valid state changes (= number of events after filtering)
during 1 second is equal to or greater than
(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, that is, 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.
1. Before Release 2.5 only greater than.
1
the set value "Input osc. level"
Values Default
50 events/s
10 events/s
1MRS750527-MUM
Default
0
1