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Adlink PCI-6208A Analog Output

Adlink PCI-6208A Analog Output block

Library

Simulink® Real-Time™ Library for Adlink

Scaling Output to Input

I/O Module Output

Block Input Data Type

Scaling

ma

Double

1

Block Parameters

Channel vector

Enter a vector of numbers to specify the output channels.

For example, to use the first and second analog output (D/A) channels enter

[1, 2]

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.

Range

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 omega radians 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.

Reset vector

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 [1], the action taken will be the same as if Reset vector was set to [1 1]. Both channels will be reset to their initial values when model execution is stopped.

Initial value vector

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 [1 2], Reset vector is [1 0], 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.

Sample time

Enter the base sample time or a multiple of the base sample time (-1 means sample time is inherited).

External Websites

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