DAC812-Adapter (DAC812-20mA)
9. DAC812-Adapter (DAC812-20mA)
9.1 Overview
The optional adapter DAC812-20mA is connected to I/O-connector P2. The adapter converts the
output voltage of 0...10 V to a current of 0(4)...20 mA. You can select between 0...20 mA and
4...20 mA via a jumper. When using a precision load resistor at the current output, the voltage drop
caused by the connected line can be compensated: if, for instance, a resistor of 500 Ω is
connected to the output configured for 0...20 mA, the voltage drop over the resistor is always
0...10 V.
The conversion from voltage/current is made via converter component XTR110 by means of a
transistor (BSS110), connected in series. Potentiometers for adjusting offset and gain are available
for each of the at most 8 channels. The channels have already been adjusted by the manufacturer.
Each of the voltage/current converters has got three jumpers, by which the three different
operating modes can be selected:
1.
Voltage output (the output voltage of the VME-DAC1612 is directly fed to the terminals of
the adapter. All voltage ranges of the VME-DAC1612 are permissible)
2.
Current output 0...20 mA
3.
Current output 4...20 mA (line break recognition)
9.2 PCB View with Jumpers
Figure 5:
Position of jumpers on the DAC812-adapter
VME-DAC1612
Manual • Doc. No.: V.1706.21 / Rev. 1.2
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