X20 system modules • Other functions • X20CM4810
X20 system User's Manual 3.10
2157
Continuous mode with enable (continuous mode)
This mode offers the following advantages:
•
When the parameters are configured correctly, nothing can be overlooked.
•
Using "enable", measurement in the module can be started after an event or events can be hidden.
•
The toggle bit toggles with every new value.
The following must be taken into consideration for the configuration:
•
In order to guarantee seamless measurement, the sample time (number of samples * sample rate) must
be longer than the X2X cycle (see section "SamplesAnalogInput" on page 2160).
•
If a shorter sample time than the X2X Link cycle is configured, the last complete measurement is always
transferred.
Information:
Values are lost here. The measured values cannot be transferred to the bus because multiple values
are calculated in each X2X Link cycle.
Trigger mode (single shot)
This mode offers the following advantages:
•
Only one measurement is taken at a time.
•
The trigger is edge-sensitive, so it can be retriggered in each X2X Link cycle.
•
The toggle bit toggles with every new value.
The following must be taken into consideration for the configuration:
•
A new trigger will be ignored during an ongoing measurement. The runtime on the bus can cause retrig-
gering before the toggle bit has changed.
•
If a shorter sample time than the X2X Link cycle is configured, then the first complete measurement is
always transferred.
•
In trigger mode, values are lost because the measurement values are recorded asynchronously to the X2X
Link and cannot be synchronized continually.
•
The trigger results in temporary synchronization with X2X Link.
AnalogInput01-04
Depending on the configuration this data point contains:
•
The actual input value of the associated input averaged over the last 8 samples
•
Or the characteristic value to be calculated using the configured number of samples
The value in the data point is scaled according to the configuration "AnalogInputScale01".
If scaling the value takes it outside of the permitted value range for INT, then it will be limited to the minimum or
maximum INT value. The overflow bit for the corresponding channel is not set in this case.
Information:
In Function model 0 - Standard, Automation Runtime automatically scales the analog input to mg or
non-dimensional values (crest factor) while taking SensitivitySensor and AnalogInputScale into ac-
count. If the value of the analog input without sensor scaling exceeds the value range of the AnalogIn-
putscale of 100 mV/g, then the corresponding AnalogInputOverflow bit is used.
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