Specifies the amount of time, in seconds, between the start of two consecutive steps in a sequence.

Syntax

NIDCPOWER_ATTR_SEQUENCE_STEP_DELTA_TIME

Numeric Value

Data Type

Access

Applies To

1150198

ViReal64

Read/Write

Channels

Remarks


You can specify this attribute as one of the attributeIDs when calling the niDCPower_CreateAdvancedSequenceWithChannels function. In this case, this attribute specifies the amount of time between the start of the active step and the start of the next step.

Note

This attribute is not supported by all devices. Refer to Supported Attributes by Device for information about supported devices.

This attribute is applicable only if the NIDCPOWER_ATTR_SEQUENCE_STEP_DELTA_TIME_ENABLED attribute is set to VI_TRUE. This attribute does not apply to the last step of the last iteration of a sequence.

Note

You can set values for the NIDCPOWER_ATTR_SOURCE_DELAY and Measure attributes in conjunction with this attribute. Values for NIDCPOWER_ATTR_SOURCE_DELAY may conflict with the value of this attribute; Measure attributes may conflict with the value of this attribute only if the NIDCPOWER_ATTR_MEASURE_WHEN attribute is set to NIDCPOWER_VAL_AUTOMATICALLY_AFTER_SOURCE_COMPLETE.

NI recommends that you configure other attributes in the Commit step when configuring NIDCPOWER_ATTR_SEQUENCE_STEP_DELTA_TIME using the niDCPower_CreateAdvancedSequenceCommitStepWithChannels function to reduce the setup time in the first step of sequence.

Note

Alternatively, you can configure other attributes in first session, then close the session and proceed to start a second session with NIDCPOWER_ATTR_SEQUENCE_STEP_DELTA_TIME. The channel retains the previous settings in the first session. As a result, the setup time is reduced in the first step. For more information, refer to Sequence Step Delta Time Timing Issues.

Valid Values

Device

Values

PXIe-4135, PXIe-4136/4137, PXIe-4138/4139

[12.5 us, 60 s]

PXIe-4140/4141, PXIe-4142/4143, PXIe-4144/4145

[10 us, 60 s]

PXIe-4147

[10 us, 26.512 s]

Default Value: Refer to Supported Attributes by Device for the default value by device.

Note

NI-DCPower coerces the value you specify for this attribute to the nearest multiple of a device-specific resolution. You can read back the value of this attribute to determine the coerced value. See the table below.

Device

Selected Value

Resolution

PXIe-4135, PXIe-4136/4137, PXIe-4138/4139

[12.5 us, 21.4748 s]

10 ns

(21.4748 s, 60 s]

10 us

PXIe-4140/4141, PXIe-4142/4143, PXIe-4144/4145

[10 us, 233.0169 ms]

27.7778 ns

(233.0169 ms, 60 s]

10 us

PXIe-4147

[10 us, 26.512 s]

6.17 ns

Related Topics:

Sequence Source Mode

Advanced Sequencing