Advantech PCI-1723 Manual de usuario Pagina 33

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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
Ri
+
-
RL
Internal External
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