Tolerance Window %, Absolute - Siemens SIMATIC ET 200SP F-AI 4xI 0(4) 20mA 2-/4-wire HF Series Manual

4.3.2.5

Tolerance window %, absolute

Function
If you have selected "1oo2 evaluation (max. SIL3/Cat.4/PLe)", you can enter the size of a
tolerance window for the discrepancy here for the channel pair. You specify the tolerance
window as a percentage of the full-scale value. The reference value is the full-scale value,
i.e. 20 mA. The entered value is rounded to one decimal place.
If two redundant input channels of the channel pair differ by more than the tolerance
specified here and for longer than the specified discrepancy time, the F-module detects a
discrepancy error and triggers a diagnostic interrupt.
For more information regarding setting the tolerance window, refer to Parameter assignment
of discrepancy analysis for 1oo2 evaluation (Page 27).
Example
You have assigned the following:
● The "Tolerance window % absolute" 10%
● The measuring range 0..20 mA
● A discrepancy time of 100 ms
The input channels may differ from the configured discrepancy time (100 ms) up to the max.
reaction time for a time window with a difference of more than 2 mA.
See also
Discrepancy time (Page 24)
Analog input module F-AI 4xI 0(4)..20mA 2-/4-wire HF (6ES7136-6AA00-0CA1)
Manual, 08/2018, A5E41448857-AB
Parameters/address space
4.3 Explanation of parameters
25