Advantech PCI-1723 Manual do Utilizador descarregar pdf (Página 33)

27 Chapter 3

Figure 3.3: Analog Output Connections

Current output mode:

Caution: The external voltage should be under 30 V.

Ri: Internal resistor= 249 ohm

Vext: External voltage

Isink : The controlled current output (0~20 mA)

Since Isink =Vext / (Ri+RL), RL can not be higher than | Vext/Imax | -Ri

For Example: Vext=24 V, Imax=20 mA

RL max = | 24 V / 20 mA | - 249= 951 (ohm)

n: 0 ~ 7

D/A n

Data Bus

Load

Vext

Isink_n

AGND

Internal External

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Advantech PCI-1723 Manual do Utilizador Página 33