Fig. 3-27 Signal Output Through The Dac Channel; Fig. 3-28 Dac Channel - Siemens MICROMASTER 420 Operating Instructions Manual

3 Functions
3.6.4 Analog output (DAC)
Number:
Parameter range:
Function chart number:
Features:
- cycle time:
- resolution:
- accuracy:
Setpoints, actual values and control signals inside the drive inverter are read-out
via the D/A converter using these analog input. The digital signal is converted into
an analog signal. All of the signals can be output via the D/A which contain the
"CO" abbreviation in the parameter text (refer to list of all of the BICO parameters
in the parameter list). Parameter P0771 defines, by assigning the parameter
number, the quantity which is output as analog signal through the DAC channel
(refer to Fig. 3-27). The smoothed output frequency is output, e.g. via the analog
output, if P0771 = 21.
Function
Fig. 3-27
In order to adapt the signal, the DAC channel has several function units (filter,
scaling, dead zone) which can be used to modify the digital signal before
conversion (refer to Fig. 3-28).
Function
Fig. 3-28
NOTE
The analog output only provides the current output (0 ... 20 mA). A 0 ... 10 V
voltage signal can be generated by connecting a 500 Ohm resistor across the
output.
94
1
r0770 – P0781
FP2300
4 ms
10 bit
1 % referred to 20 mA
r0020 CO: Freq. setpoint before RFG
r0021 CO: Act. filtered frequency
r0024 CO: Act. filtered output freq.
r0025 CO: Act. filtered output voltage
r0026 CO: Act. filtered DC-link volt.
r0027 CO: Act. filtered output current
...
r0052 CO/BO: Act. status word 1
r0053 CO/BO: Act. status word 2
r0054 CO/BO: Act. control word 1
...
rxxxx r0755
Pxxxx P0771
Signal output through the DAC channel
P0773
r0755 rxxxx Pxxxx P0771
DAC channel
D
D/A conv.
channel
A
P0781
DAC DAC
scaling dead zone
MICROMASTER 420
Issue 07/04
KL
D/A conv.+
KL
D/A conv.
r0774
KL
D
DAC+
KL
A
DAC
Operating Instructions
6SE6400-5AA00-0BP0