Analog Output (Dac) - Siemens MICROMASTER 440 Operating Instructions Manual

Issue 10/06
6.4.7

Analog output (DAC)

CI: DAC
P0771 = ...
Defines function of the 0 - 20 mA analog output.
21 CO: Output frequency (scaled according to P2000)
24 CO: Frequency inverter output frequency (scaled according to P2000)
25 CO: Output voltage (scaled according to P2001)
26 CO: DC link voltage (scaled according to P2001)
27 CO: Output current (scaled according to P2002)
NOTE
For P0771 to P0781, the following applies:
Index 0 : Analog output 1 (DAC1), terminals 12, 13
Index 1 : Analog output 2 (DAC2), terminals 26, 27
P0773 =... Smooth time DAC
Defines smoothing time [ms] for analog output signal. This parameter enables smoothing
for DAC using a PT1 filter.
Permit absolute value
P0775 = ...
Decides if the absolute value of the analog output is used. If enabled, this parameter will
take the absolute value of the value to be outputed. If the value was originally negative then
the corresponding bit in r0785 is set, otherwise it is cleared.
0 OFF
1 ON
DAC type
P0776 = ...
Defines the analog output type.
0 Current output
1 Voltage output
NOTE
• P0776 changes the scaling of r0774 (0 – 20 mA ⇔ 0 – 10 V)
•
Scaling parameters P0778, P0780 and the dead zone are always entered in 0 – 20 mA
For the DAC as voltage output, the DAC outputs must be terminated using a 500 Ω resistor
Value x1 of DAC scaling
P0777 = ...
Defines the output characteristic value
x1 as a %.
This parameter represents the lowest
analog value as a % of P200x
(depending on the setting of P0771).
Value y1 of DAC scaling
P0778 = ...
This parameter represents the value for
x1 in mA.
Value x2 of DAC scaling
P0779 = ...
Defines the output characteristic value
x2 as a %.
This parameter represents the lowest
analog value as a % of P200x
(depending on the setting of P0771).
Value y2 of DAC scaling
P0780 = ...
This parameter represents the value for x2 in mA.
Width of DAC deadband
P0781 = ...
Sets width of deadband in [mA] for analog output.
MICROMASTER 440
Operating Instructions (Compact)
0.0 %
mA
20
P0780
y
0
2
P0781
P0778
y
1
100.0 %
6 Commissioning
21
2 ms
0
100 %
P0777 P0779
x x
1 2
20
0
%
39