56
Functions
Figure 14: Tolerance Window and Discrepancy Mode – Minimum Unit Value
Tolerance settings are made via the "Tolerance Window" parameter, which is
described in Section "Commissioning" > ... > "Setting Parameters". The
parameters to be set and the formulas for calculation are listed below.
The following parameters must also be set:
•
Sensor evaluation
•
Relative tolerance and/or
•
Absolute tolerance
•
Discrepancy time
Formula for calculating the absolute tolerance from the process values:
Factor
PW
abs
PW
MA
PW
ME
T
abs
Manual
Version 1.0.0, valid from HW/SW Version 01/01
753-668/000-004 4FAI 0/4-20 mA Diff PROFIsafe
(
∆
= ±
Value
Absolute tolerance of the process value
Process value for start of measurement range (depending
on measurement range and analog value data format)
Process value for end of measurement range (depending
on measurement range and analog value data format)
Set absolute tolerance in %
WAGO-I/O-SYSTEM 750
) ∗
−
100