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Chapter 3

Functional Details

Isolated inputs

The CIO-DISO48 has 48 isolated input channels. A schematic of a single channel is shown in Figure 6.

Figure 6. Isolated input schematic – simplified

AC or DC input signals are applied to a bridge rectifier so that the inputs are not polarity sensitive. On AC

inputs, the bridge output is a "pulsating" DC voltage. Closing the filter switch smoothes this pulsating voltage to

steady DC.

Extending the input range

To extend the input range beyond the 5-28 V specified, add an external resistor. Figure 7 shows the resistor and

the equations used to calculate resistor values for a given Vin.

Figure 7. Input range-extending resistor

For more information on digital signal connections

For more information on digital signal connections and digital I/O techniques, refer to the Guide to Signal

Connections. This document is available on our web site at available on our web site at

www.mccdaq.com/signals/signals.pdf).

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Measurement-computing CIO-DISO48 Manuale Utente Pagina 13