General Standards PMC-16AO-12 Analog Output - PMC-16AO-12 Analog Output block

Library

xPC Target Library for General Standards

Scaling Input to Output

The analog output range of this board depends on the output range that was chosen at the time of purchase. This range can be +-2.5, +-5.0, or +-10.0.

Hardware Output	Block Input Data Type	Scaling
Volts	Double	1

Block Parameters

Channel vector

Enter numbers between 1 and 12. This is a vector parameter that specifies the hardware output channels. For example, to produce output on channels 2 and 3, enter

[2 3] 

All unspecified channels are set to 0.0 volts on output.

Number the channels beginning with 1 although the board manufacturer starts numbering the channels with 0.

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 used for all channels. 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 [ 2 3 ] 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 voltage 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 the initial value for all channels. 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 5 8], Reset vector is [1 0 1], and Initial value vector is [2.3 5.6 0]. On initial download, channel 2 is set to 2.3 volts, channel 5 to 5.6 volts, and channel 8 to 0.0 volts. When the model is stopped, channel 2 resets to 2.3 volts, channel 5 remains at the last value attained, and channel 8 resets to 0.0 volts.

Range

From the list, choose either +-2.5, +-5.0, or +-10.0. The PMC-16AO-12 is specified at purchase time as having one of these three ranges. Choose the range to match that for which the board is configured.

Note that the range you set does not alter any configuration on the board. It is used to scale the signal when it is converted to a 16-bit value to be written to the output D/A converter (DAC).

Autocalibration

The PMC-16AO-12 can check its own calibration (autocalibration) against an internal voltage reference. Choose this check box to execute the autocalibration cycle when the model is downloaded to the target computer. The output ports show a square wave during the cycle. The calibration cycle yields adjustment factors that are retained in onboard NVRAM. The PMC-16AO-12 reads these adjustment factors when the board is initialized. Unless you subject this board to harsh conditions, you should only need to run autocalibration occasionally—for example, once a month.

Note   The calibration cycle takes several seconds to run. Refer to the PMC-16AO-12 documentation for further information on autocalibration.

Ground sense

Choose this check box to enable the hardware provided compensation for ground potential differences. Refer to the PMC-16AO-12 documentation for further information on ground sense.

Sampletime

Enter the base sample time or a multiple of the base sample time.

PCI slot

If only one board of this type is in the target computer, enter

-1 

to automatically locate the board.

If two or more boards of this type are in the target computer, enter the bus number and the PCI slot number of the board associated with this driver block. Use the format [BusNumber, SlotNumber]. To determine the bus number and the PCI slot number, type

getxpcpci

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