Functions
8.6 Analog outputs (D/A converter)
Control Units CU240S
Operating Instructions, 11/2006, A5E00766042B AA
8-21
1
0
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$2
$2
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3
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3
3
3
3
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3
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$2
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Figure 8-14 D/A converter channel
Note
The analog output 0 (AO0) can be changed-over from current output (P0776 = 0) to voltage
output (P0776 = 1).
The analog output 1 (AO1) only provide current output (0 … 20 mA). The 0 … 10 V voltage
signal can be generated by connecting a 500 Ω resistor across the outputs. The voltage drop
across the resistor can be read using parameter r0774 if the parameter P0776 is changed-
over from current output (P0776 = 0) to voltage output (P0776 = 1). The D/A scaling
parameters P0778, P0780 and the D/A converter dead zone must still be entered in mA (0
… 20 mA).
With setting parameter P0775 = 1 it is possible to detect negative values on the input side of
the D/A converter channel. If enabled, this parameter will take the absolute value of the
value to be outputed (the AO-linear characteristic is mirrored on the y axis). If the value was
originally negative then the corresponding bit in r0785 is set.
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