HIL Watchdog Reload

Owning Palette: HIL/Core/Watchdog

Requirements: Quanser Rapid Control Prototyping Toolkit, LabVIEW 2020 or newer

Description

Reloads the watchdog timer. If the watchdog had already expired then it does not clear the expiration state. The watchdog must be cleared in order to begin writing to the outputs again.

Required Inputs All required inputs must be wired. They appear in bold text in the context help window for the VI.

board in is a reference to a HIL Board instance that represents the open HIL board. This input must be wired to a valid HIL Board signal, as generated by a HIL Initialize VI.

Recommended Inputs Recommended inputs need not be wired. They appear as simple text in the context help window for the VI.

error in describes error conditions occurring before the VI executes. If an error has already occurred, the VI returns the value of the error in cluster in error out.

status is TRUE if an error occurred. If status is TRUE, the VI does not perform any operations.

code is the error code number identifying an error. A value of 0 means no error, a negative value means a fatal error, and a positive value is a warning. Refer to the Quanser Error Codes for a code description.

source identifies where an error occurred. The source string is usually the name of the VI that produced the error.

Outputs

board out is a copy of the HIL Board instance passed to the board in input.

expired is a boolean scalar that is true if the watchdog has expired and false otherwise.

error out contains error information. If the error in cluster indicated an error, the error out cluster contains the same information. Otherwise, error out describes the error status of this VI.

	status is TRUE if an error occurred. If status is TRUE, the VI does not perform any operations.
	code is the error code number identifying an error. A value of 0 means no error, a negative value means a fatal error, and a positive value is a warning. Refer to the Quanser Error Codes for a code description.
	source identifies where an error occurred. The source string is usually the name of the VI that produced the error.

Details

The HIL Watchdog Reload VI reloads the watchdog timer so that it restarts counting. This VI is typically called in a control loop to ensure that the watchdog never expires unless an iteration of the loop takes longer than expected to execute or the application crashes unexpectedly. It is a safety feature used to shut down hardware in the event of software failure.

Feedthrough Behaviour

All input/output pairs of this function have direct feedthrough behaviour.

Examples

There are currently no examples

Targets

Target	Supported	Comments
RCP Windows (64-bit) Target	Yes	Fully supported.

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	HIL Watchdog Clear	Clears the watchdog state of a HIL board.
	HIL Watchdog Start	Starts the watchdog timer. If the watchdog timer is allowed to expire then it resets all the outputs of the data acquistion cards to the programmed expiration states.