X20 system modules • Analog input modules • X20AI2438
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X20 system User's Manual 3.10
4.3.7.9.7.7 Hysteresis
Names (pChannelName):
Hysteres_1
Hysteres_2
If the user-specific limit values are being used, then a hysteresis range should also be defined. The "Hysteresis"
registers configure how far a limit value can be exceeded before a response is triggered.
Data type
Values
INT
-32767…32767
UINT
0...65535
Te hysteresis value must be set for the respective analog input dpending on the configured normalization. The
error status is cleared if the actual analog value changes by at least this hysteresis value from the limit value in the
allowed direction. Using a default value of 100 µA, the following values and formulas result for this parameter:
•
Displaying 0..25 mA as 0..25000 : 100
•
Displaying 0..25 mA as 0..32767 : 131, limit value = ([µA]*32767)/25000
•
Displaying 4..20 mA as 0..32767 : 156, limit value = [µA]*1.5625
•
Displaying 0..25 mA as 0..65535 : 262, limit value = ([µA]*65535)/25000
4.3.7.9.7.8 ErrorDelay
Names (pChannelName):
ErrorDelay_1
ErrorDelay_2
This register specifies the number of consecutive conversion procedures where an error is pending until the cor-
responding individual error status bit is set. The delay applies to underflow, overflow and open circuit errors. This
delay can be used to hide temporary measurement value deviations, for example.
Data type
Values
UINT
0...10: Error formation delay [conversion cycles]
2 conversion cycles [default]
4.3.7.9.7.9 SumErrorDelay
Names (pChannelName):
SumErrorDelay_1
SumErrorDelay_2
This register specifies the time in milliseconds that one of the individual error bits must be pending until the com-
posite error status bit is set.
Data type
Values
UINT
0...65535: Composite error bit delay [msec]
4000 msec [default]
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