Siemens SIMATIC ET 200SP Manual page 28

Parameters
4.6 Explanation of the analog input parameters
Diagnostics underflow
Enabling of the diagnostics when the measured value falls below the underrange.
Diagnostics HART
Enables diagnostics for HART frame-specific monitoring and the status information provided
by the connected field device in a HART frame (HART device status).
HART diagnoses are output as maintenance events.
Wire break limit
You use this to specify the current limit for detecting wire breaks. When the current is below
the configured wire break limit, the measured value is declared as invalid and, when wire break
diagnostics is enabled, a corresponding diagnosis is generated. The value status of the analog
input is set to "bad".
With a wire break limit of 3.6 mA, the measured value becomes invalid when the current falls
below 3.6 mA and is marked as valid again when it rises above 3.8 mA.
There is no hysteresis for a wire break limit of 1.185 mA.
Smoothing
The individual measured values are filtered to smooth them. Four smoothing settings are
available.
Smoothing time = number of module cycles (k) x cycle time of the module.
The figure below shows the number of module cycles after which the smoothed analog value
approached 100%, in line with the set smoothing. This applies to every signal change at the
analog input.
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Input/output module AI-DI 16/DQ16x24VDC HART HA (6DL1133-6EW00-0PH1)
Manual, 05/2017, A5E39294170-AA