Campbell-scientific SDM-IO16 16-Channel Input/Output Expansion Module Manuale Utente Scaricare il pdf (Pagina 11)

SDM-IO16 16 Channel Input/Output Expansion Module

From sensor

510

5 V

100 K

To internal logic

5.6 V

O V

a) Input biasing and protection

0.6 V Dro

Out

550 Ω

b) Output set ON c) Output set OFF

510 Ω

5 V, 0Ω

0.33

FIGURE 2. Simplified Equivalent Port Circuits

3. Power Considerations

For most applications, especially for pulse counting or status inputs, it is more

normal to use the datalogger supply to power the SDM-IO16, as shown in

Figure 3(a).

When being used for control and outputting current the SDM-IO16 power

requirements can be large compared to most Campbell Scientific products

when driving significant loads. For this type of application an external power

supply, as shown in Figure 3(b), is recommended to power the SDM-IO16.

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Campbell-scientific SDM-IO16 16-Channel Input/Output Expansion Module Manuale Utente Pagina 11