Siemens SIMATIC ET 200SP F-AI 4xI 0(4) 20mA 2-/4-wire HF Series Manual page 29

Analog input module
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Configuring the discrepancy analysis parameters
The following four parameters for the discrepancy analysis are assigned for each channel
pair:
● Discrepancy time
● Standard value
● Tolerance window %, absolute
● Tolerance window %, relative
"Discrepancy time" parameter
If the following is true, the F-module detects a discrepancy error:
● The process value that does not represent the standard value is outside the configured
tolerance window.
● Lasts longer than the configured discrepancy time.
● Lasts at maximum the duration of the maximum response time.
In the case of a discrepancy error, the F-module triggers a diagnostic interrupt and sets the
process value to 7FFF
discrepancy time is reset if the standard value lies within the tolerance window again.
In the PII, the substitute value 0 is set for the safety program.
You calculate the maximum discrepancy time that is permitted in the respective application
using the following formula:
Discrepancy time = Maximum response time (in case of discrepancy error) – 2 × Conversion
cycle time × Smoothing – 2 × Conversion cycle time
Note
You calculate the discrepancy time by using the values from section Discrepancy time
(Page 69) in the above equation.
You can assign the discrepancy time for each channel pair.
"Standard value" parameter
You can select which of the two values is to be signaled to the F-CPU for each input channel
pair. During a discrepancy between the two input channels, the last valid standard value
prior to occurrence of the discrepancy is signaled to the F-CPU.
● "MIN": The lower of the two values is signaled to the F-CPU as the standard value.
● "MAX": The higher of the two values is signaled to the F-CPU as the standard value.
Analog input module F-AI 4xI 0(4)..20mA 2-/4-wire HF (6ES7136-6AA00-0CA1)
Manual, 08/2018, A5E41448857-AB
for S7-300/400 F-CPUs or 0 for S7-1200/1500 F-CPUs. The
H
Parameters/address space
4.3 Explanation of parameters
29

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