Watchdog Configure VI

LabVIEW 2017 Real-Time Module Help

Edition Date: March 2017

Part Number: 370622R-01

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Owning Palette: RT Watchdog VIs

Requires: Real-Time Module

Configures a new watchdog object with a timeout and expiration actions.

Note  Configuring a watchdog object does not start the watchdog counter. Use the Watchdog Start VI or the Watchdog Whack VI to start the watchdog counter.

Details  Example

timeout specifies the time, in seconds, that the function waits before the watchdog timer expires. The timeout period is coerced to a value determined from the available timebase and initial count values. The default is 1 second.
expiration actions specifies which actions to take when the watchdog timer expires. You can use any combination of actions. However, not all targets support all actions. Refer to the specific RT target hardware documentation for information about supported actions.
reset reboots the PXI controller.
occurrence sets the occurrence when the watchdog timer expires.
trigger line is the trigger line on the PXI bus to be asserted when the watchdog timer expires. Refer to the specific RT target hardware documentation for information about supported trigger lines.
trigger protocol is the protocol used for trigger action on the PXI bus when the watchdog timer expires.

active highSets the trigger action to be active when the line is high.
active lowSets the trigger action to be active when the line is low.
open collectorSets the trigger action to operate as an open collector output.
error in describes error conditions that occur before this node runs. This input provides standard error in functionality.
watchdogID identifies the watchdog object.
timeout value returned specifies the time, in seconds, for the watchdog timer. The timeout period specifies the amount of time that must elapse before the watchdog timer expires. The timeout period is coerced to a value determined from the available timebase and initial count values. The default is 1.
occurrence is the occurrence associated with the interrupt action that asserts when the watchdog timer expires.
error out contains error information. This output provides standard error out functionality.

Watchdog Configure Details

Supported timeout values vary by target. This VI coerces timeout up to the next supported value and returns the actual value as timeout value returned (sec). The value of timeout value returned (sec) is always greater than or equal to the timeout value you specify. The occurrence output of this VI returns a reference to the occurrence action you specify using the expiration actions input.

This VI does not reserve trigger lines, nor does it discriminate between reserved and unreserved trigger lines. If you specify a trigger line that has been reserved elsewhere, the watchdog object overwrites the existing value on the trigger line when the timer expires.

Example

Refer to the Watchdog - RT Engine.lvproj in the labview\examples\Real-Time Module\NI Watchdog directory for an example of using the Watchdog Configure VI.

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