Siemens S7-300 - Parameter Assignment of Discrepancy Analysis for 1 Oo2 Evaluation

Analog modules
9.3 SM 336; F-AI 6 x 0/4 ... 20 mA HART
Fail-safe signal modules
Installation and Operating Manual, 01/2010, A5E00085586-10
271
9.3.15.2 Parameter assignment of discrepancy analysis for 1oo2 evaluation
O
perating principle of discrepancy analysis
A discrepancy analysis is performed when 1oo2 evaluation is assigned.
An assignable tolerance window is formed around the process value that represents the
instantaneous standard value (value that is signaled to the F-CPU).
The tolerance window is formed relative to the process value or as an absolute value relative
to the measuring range end value. In addition, a relative tolerance window and an absolute
tolerance window can be combined.
If the process value does not represent the standard value at an instant and is within the
tolerance window,
no discrepancy exists.
W
,>P$@


3URFHVVYDOXHฬ6WDQGDUGYDOXH
3URFHVVYDOXH
Figure 9-39 Example of a relative tolerance window without discrepancy (parameter assignment:
standard value = MAX)