Advantech PCI-1720U Uživatelský manuál stáhnout pdf (Strana 33)

27 Chapter 5

Figure 5.6: Floating-load Conn. with an Internal +12 VDC Power Supply

5.4 Current Sink Load and Power Supply

You have to select the current sink load and power supply carefully. The

current sink circuitry of the PCI-1720U is as shown below.

Figure 5.7: PCI-1720U Current Sink Circuitry

Internal Side External Side

+12 V

SINK

AGND

0 ~ 20 mA

4 ~ 20 mA

Floating

Load

Internal Side External Side

AGND

0 ~ 5 V

1 ~ 5 V

249

Ω

0 ~ 20 mA

4 ~ 20 mA

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Advantech PCI-1720U Uživatelský manuál Strana 33