Functions
8.5 Analog inputs (A/D converter)
Control Units CU240S
Operating Instructions, 11/2006, A5E00766042B AA
8-19
Depending on the AI type or source, the appropriate connection must be made. Using, as an
example, the internal 10 V voltage source, a connection is shown in the figure below.
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Figure 8-12 Example of a connection for AI voltage and current input
The AI channel has several function units (filter, scaling, dead zone, see figure below).
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Figure 8-13 AI channel
Note
When the filter time constant P0753 (AI-PT1) is increased, this smooths the AI input signal
therefore reducing the ripple. When this function is used within a control loop, this smoothing
has a negative impact on the control behavior and immunity to noise (the dynamic
performance deteriorates).
Note
The analog inputs can be used as digital inputs. Setting P0712 and P0713 > 0 assign digital
input functions to the analog inputs.
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