FILTERED ANALOG INPUT (Filtered AI)

Filtered Analog Input (Filtered AI)

A low-pass filter is added after the analog input.

The filtered analog input is only available on controllers with a DC voltage supply and indicated by XX VDC. Input units which accept an analog signal will also accept a digital signal (DI). The selection is made by the programmer, who can place one of the two symbols accessible in the IN tab of the function bar on the unit.

The analog input can only be placed on units I5 to I8 (or I12) of the controller. The first four units can only be used for DI inputs.

The analog input is converted into an integer value by an 8-bit analog to digital converter. The integer value of the output is between 0 and 255.

By default, the input voltage varies from 0 to 10 V. The user can connect the input to a potentiometer with a supply between 0 and the controller supply voltage. The selection is entered in the Parameters tab in the parameterisation box of the function.

Reminders:

Because the filtering is numerical, the filter cut-off frequency can be selected from the 255 frequencies available in the Parameters tab.

Important note: If the cycle time of the controller is changed, the filter cut-off frequency must be checked/adjusted.

For more detailed information, see below:

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