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REC 523
5.4.2.5.
38
Remote Monitoring and Control Unit
Technical Reference Manual
The digital input is regarded as non-oscillating if the number of valid status 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 (status is valid) and an event is generated.
Table 5.4.2.4-1 Oscillation suppression parameters
Parameter
Input osc. level
Input osc. hyst.
Unlike most parameters for digital I/O cards, the parameters
Input osc. level and Input osc. hyst. can be found in
the Relay Setting Tool: open the Configuration tab and select the
General subtab.
Attributes of a digital input for device configuration
The validity of the digital input (invalidity), the status of the input (value) and the
time tag for the status change (time) 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. The attributes are available in REC configuration and can be used for different
purposes.
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 status changes per second exceeds the set Input osc. level
parameter 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 parameter value minus the set Input osc. hyst.
parameter value (events/s).
Value (BI#)
Depending on the status of the digital input, the digital input value is TRUE (1) or
FALSE (0). The attribute BI# value changes on the rising or falling edge of the input.
To prevent undesired status changes of the digital input due to, for example, switch
debouncing, the change of the attribute value is delayed by the filter time.
A counter attribute of a digital input is not handled when the input is programmed
as a normal digital input.
Time (BI#Time)
Values
2...50 events/s
2...50 events/s
1MRS750881-MUM
Default
50 events/s
10 events/s
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