User Manual

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08/04 AWB2528-1423GB
QA analog output The analog output operates with decimal values between 0
and 1023. This corresponds to a 10-bit resolution. At the
output this corresponds to a physical voltage between 0 V
and 10 V DC.
Negative values such as: –512 are evaluated as zero and
output as 0 V DC.
Positive values greater than 1023, such as: 2047, are
evaluated as 1023 and output as 10 V DC.
Behaviour with assignment of values exceeding 1023
Formula for calculation of the physical value:
Figure 135: Step behaviour on analog output QA
Warning!
Valid for operating system versions up to 1.02.154: If an
analog output is assigned with a value greater than 1023,
a physical value is output which is calculated using the
following formula. The result can cause sudden steps on
the analog output.
Y = X – 1023 x n
Y = physical value
X = value which is assigned to the QA operands
n = factor which defines the frequency of occurrence of the
1023 as a whole number in “X”.
10 V
1023 20470