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S5-90U/S5-95U Analog Value Processing
Accuracy of the Analog Value Output
In order to establish the accuracy of an analog output value (actual analog value), you have to
calculate the absolute error of the analog value.
Use the formula below to determine the absolute error of the analog value output:
Absolute error =
a a a a a a a a a a a a a a a a a a a a a a a a a
a a a a a a a a a a a a a a a a a a a a a a a a a
a a a a a a a a a a a a a a a a a a a a a a a a a
a a a a a a a a a a a a a a a a a a a a a a a a a
a a a a a a a a a a a a a a a a a a a a a a a a a
a a a a a a a a a a a a a a a a a a a a a a a a a
a a a a a a a a a a a a a a a a a a a a a a a a a
a a a a a a a a a a a a a a a a a a a a a a a a a
Nominal analog
output value Operational limit in %
100%
Please refer to the Technical Specifications for the PLC (see Appendix B) or the respective analog
output module (see Chapter 15) for nominal value and operational limit of the analog output.
The actual analog value is within the following range:
Output
value
-
Absolute
error
Actual
value
Output
value
+
Absolute
error
Actual value = Output value ± Absolute error
Example: The analog value of 6.4 V was output at a 2 x ± 10 V analog output module.
The nominal value for the analog output is ± 10 V. The operational limit for this module
is ± 0.6 %. Determine the accuracy of the analog value.
Absolute error= 10 V
0.6%
100%
=0.06 V
Actual
value
6.4 V - 0.06 6.4 V + 0.06 V
Actual analog value = 6.4 V±0.06 V
The accuracy of the analog value varies within the range of ± 0.06 V.
EWA 4NEB 812 6115-02b
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