X20 system modules • Temperature modules • X20ATC402
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X20 system User's Manual 3.10
4.31.8.9.7.2 PreparationInterval
Name (pChannelName):
Cfo_PreparationInterval01
Cfo_PreparationInterval[02…06]
If the last valid measurement value should be kept when violating the limit value, then PreparationInterval must be
defined. The measurement values continue to be acquired and converted according to the configured I/O update
time. They are then checked and discarded if they do not meet the specifications. When an error does not occur,
therefore, the measurement value acquired two preparation intervals ago is constantly output.
Data type
Values [0.1 ms]
UINT
0…65535
"Application"
for the value being measured (analog)
↓
Condition:
- Conversion interval (ADC) elapsed
"Measurement value memory"
Measurement value (digital)
↓
Condition:
- PreparationInterval elapsed
- Measurement value permissible
"Buffer"
Last valid value
↓
Condition:
- PreparationInterval elapsed
- Measurement value permissible
How it works:
Measured values are converted at the configured conversion rate and saved to measurement value memory.
The current contents of the measurement value memory are checked within the configured interval. If a permis-
sible value is present, then the contents of the buffer memory are passed to output memory and the contents of
the measurement value memory are passed to the buffer.
If the check turns up an impermissible value, then the contents of the measurement value memory are discard-
ed. The copy direction between the output and buffer memory reverses and the last valid value continues to be
output.
Information:
If configured to keep the last valid value, the delay time from measuring to outputting the value
will be at least twice the preparation interval. In the worst case scenario, this can also take twice
the interval time plus the configured ADC conversion rate.
"Output memory"
Next-to-last valid/
displayed value
Information:
The registers are only set for the channel when "SensorType" bit 13 is set.
4.31.8.9.7.3 ReplaceUpper, ReplaceLower
Names (pChannelName):
Cfo_ReplaceUpper01
Cfo_ReplaceUpper[02…06]
Cfo_ReplaceLower01
Cfo_ReplaceLower[02…06]
The "Replace" register is used to define the static values to be displayed instead of the current measurement value
when the limit is violated.
Data type
Values
INT
-32767…32767
Information:
The registers are only set for the channel when "SensorType" bit 13 is not set.
4.31.8.9.7.4 UpperLimit, LowerLimit
Condition: The registers are only set for the channel when "ClampType" bit 14 is set.
Names (pChannelName):
Cfo_UpperLimit01
Cfo_UpperLimit[02…06]
Cfo_LowerLimit01
Cfo_LowerLimit[02…06]
If the value range needs to be restricted further, the "UpperLimit" and "LowerLimit registers can be used to enter
new user-specific limit values.
Data type
Values
INT
-32767…32767
UINT
0...65535
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