WAGO-I/O-SYSTEM 750
Device Description
43
753-668/000-004 4FAI 0/4-20 mA Diff PROFIsafe
Manual
Version 1.0.0, valid from HW/SW Version 01/01
Table 23:
T
GA
: Offset Defined by Smoothing and Sampling
T
GA
Sampling Frequency in Hz
100
60
50
10
S
moothi
ng
i
n
nu
mber
o
f
sa
mpl
ing
va
lue
s
1
27 ms
41 ms
46 ms
202 ms
2
36 ms
56 ms
65 ms
294 ms
4
54 ms
87 ms
102 ms
479 ms
8
92 ms
150 ms
176 ms
848 ms
16
165 ms
273 ms
323 ms
1585 ms
32
313 ms
521 ms
618 ms
3061 ms
64
608 ms
1017 ms
1208 ms
6012 ms
3.6.10.3.1 Accuracy of Discrepancy Monitoring
Discrepancy monitoring checks the duration of a deviation of the values of two
channels of a channel pair across the parameterized tolerance band. If the
duration of the deviation exceeds the configured discrepancy time, a discrepancy
error is reported. Since the discrepancy time (t
4
-t
2
) measured in the F AI module
can deviate from the actual discrepancy time (t
3
-t
1
) between the input signals
(see Figure “Discrepancy Time Measurement”), formulas are specified for
determining the limiting values of the actual discrepancy time for secure detection
and non-detection of a discrepancy error.
Figure 12: Discrepancy Time Measurement