Adlink PCI-6208A Analog Output block
Simulink® Real-Time™ Library for Adlink
I/O Module Output
Block Input Data Type
Enter a vector of numbers to specify the output channels.
For example, to use the first and second analog output (D/A) channels enter
The channel numbers can occur in arbitrary order. Number the channels beginning with 1 even if this board manufacturer numbers them beginning with 0. The maximum allowable channel number is 4.
From the list, choose
0 to 20 ma
5 to 25 ma
4 to 20 ma
Signal input to the block is in milliamperes (mA). The output voltage maximum is 10 volts. If the resistance is too large to get the chosen current, the voltage measured across the output load will saturate.
For example, assume an input sine wave with:
Input = 10*sin(omega*t) + 10
If you set the range to
0 to 20 ma, the current
should oscillate from 0 to 20 ma at
per second. The current will only reach 20 ma if the load resistance
is less than or equal to 500 ohms. If the load resistance is 1000
ohms, the maximum current that 10 volts can drive is only 10 ma. The
top half of the sine wave will be clipped off.
Note the following:
This block is scaled for the current output ports, not the voltage output ports.
This block limits output to positive values only. This is in response to the manufacturer documentation, which cautions that driving a negative voltage from the D/A converter to the voltage to current output board might cause damage to the current output.
The reset vector controls the behavior of the channel at model
termination. Enter a scalar or a vector that is the same length as
the channel vector. If you specify a scalar value, that setting is
replicated over the channel vector. If you specify a value of 1, the
corresponding channel is reset to the value specified in the initial
value vector. If you specify a value of 0, the channel remains at
the last value attained while the model was running. For example,
if Channel vector is
[1 2] and
the Reset vector is
action taken will be the same as if Reset vector was set to
1]. Both channels will be reset to their initial values
when model execution is stopped.
The initial value vector contains the initial current values
for the output channels. Enter a scalar or a vector that is the same
length as the channel vector. If you specify a scalar value, that
value is replicated as initial value over the channel vector. The
channels are set to the initial values between the time the model
is downloaded and the time it is started. When model execution is
stopped, the corresponding position in Reset vector is
checked. Depending on that value, the channel is either reset to the
initial value or remains at the last value attained while the model
was running. For example, assume that Channel vector is
2], Reset vector is
and Initial value vector is [2.3 5.6]. On initial
download, channel 1 is set to 2.3 ma and channel 2 to 5.6 ma. When
the model is stopped, channel 1 resets to 2.3 ma and channel 2 remains
at the last value attained.
Enter the base sample time or a multiple of the base sample
-1 means sample time is inherited).