Siemens SIMATIC S5 - Page 60

S5-115F Manual Configuring with COM 115F
where
r
max. value
= Relative deviation referred to the maximum value
r
min. value
= Relative deviation referred to the minimum value
r
mean value
= Relative deviation referred to the 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:
r
max. value
=
A - B
A
=
100 - 70
100
ˆ= 30 %
r
min. value
=
A - B
B
=
100 - 70
70
ˆ= 42.9 %
r
mean value
=
A - B
(A+B)
=
100 - 70
(100+70)
ˆ= 35.3 %
• 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 ( 6.1.3), you
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 1-47