Siemens SIMATIC S5 Manual page 60

S5-115F Manual
where
r = Relative deviation referred to the maximum value
max. value
r = Relative deviation referred to the minimum value
min. value
r = Relative deviation referred to the mean value
mean value
A = Read value in subunit A
B = Read value in subunit B
Example:
The read value of the signal in subunit A is 100 units and, in subunit B, 70 units.
Therefore:
A - B
r =
max. value
A
A - B
r =
min. value
B
A - B
r =
mean value
(A+B)
• Valid value
Enter here how the unit value is to be generated from the values read into subunit A and B.
Note
If you have initialized software wire-break detection in FB 250 ANEI (
must enter "1" here.
• CH DQ byte/Half-byte (H/L): This assignment defines four bits for switching the analog input
module between sensor and check output module.
• Lower/Upper check value: Enter the lower and upper check values from the raw value range
of your analog signal here. The check values must be between 0 and 1535 ( Vol. 1, 10.11.4 of
the Manual).
Note
The check values have safety characteristics. You must check the configured values
against a printout generated with COM 115F DOCUMENT.
EWA 4NEB 811 6149-02
100 - 70
= ˆ = 30 %
100
100 - 70
= ˆ = 42.9 %
70
100 - 70
= ˆ = 35.3 %
(100+70)
Configuring with COM 115F
6.1.3), you
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