Using the AD (Analog to Digital)
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Using the AD (Analog to Digital)
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VERY IMPORTANT Analog inputs of LadderDIP are directly connected to the on-board NXP microcontroller. Input voltage for these signals MUST NOT exceed the range 0 - 3.0V
Refer to this table: DC/AC Parameters and absolute max ratings |
There are six on-board A/D (Analog to Digital Converter) available on LadderDIP. These resources are accessible, in the Ladder diagram, using the AD_CONV function block.
This block has un unique output pin that gives the value of the converted analog input. The output value can span from 0 to 1023 (10 bits)
In order, to use the AD_CONV block, follow the listed instructions
| • | Use the AD_CONV block configuring the CHANNEL parameter according to the following table |
ANALOG INPUT |
POSITION |
CHANNEL |
AIN1 |
P1-5 |
0 |
AIN2 |
P1-6 |
1 |
AIN3 |
P1-14 |
2 |
AIN4 |
P1-15 |
3 |
AIN5 |
P2-30 |
4 |
AIN6 |
P2-32 |
5 |
| • | Also configure the AD_CONV block with the following parameters |
PARAMETER |
VALUE |
NOTE |
SPAN |
1 |
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OFFSET |
0 |
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| • | Using the Pin Configuration Dialog (Options  Configuration "Pin Configuration Tab") set the pin you want to use as Analog Input to "AD" |
