22.6 SUMMARY

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A/D conversion will convert a continuous value to an integer value.

D/A conversion is easier and faster and will convert a digital value to an analog value.

Resolution limits the accuracy of A/D and D/A converters.

Sampling too slowly will alias the real signal.

Analog inputs are sensitive to noise.

The analog I/O cards are configured with a few words of memory.

BTW and BTR functions are needed to communicate with the analog I/O cards for older PLCs such as the PLC-5s.

Analog shielding should be used to improve the quality of electrical signals.