Table Of Contents

Relay Control (G Dataflow)

Version:
Last Modified: March 3, 2017

Controls individual relays of the switch module. When controlling individual relays, the protection offered by setting the usage of source channels and configurations channels is void.

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session in

Control that identifies a particular NI-SWITCH session established with the niSwitch Initialize With Topology node, the niSwitch Initialize With Options node, or the niSwitch Initialize node.

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error in

Error conditions that occur before this node runs.

The node responds to this input according to standard error behavior.

Standard Error Behavior

Many nodes provide an error in input and an error out output so that the node can respond to and communicate errors that occur while code is running. The value of error in specifies whether an error occurred before the node runs. Most nodes respond to values of error in in a standard, predictable way.

error in does not contain an error error in contains an error
If no error occurred before the node runs, the node begins execution normally.

If no error occurs while the node runs, it returns no error. If an error does occur while the node runs, it returns that error information as error out.

If an error occurred before the node runs, the node does not execute. Instead, it returns the error in value as error out.

Default: No error

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relay names

Name of the relay or set of relays to control.

You can supply a single relay name or comma-delimited list of relay names to control these relays. Examples of valid relay names are ch0, ab0, 1wire, and hlselect.

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Note  

Use the niSwitch Wait For Debounce node, the niSwitch Switch Is Debounced node, and the Is Debounced property to determine if the relay has settled.

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relay action

Value that specifies whether to open or close the relay.

Name Description
Open Relay

Opens the relay.

Close Relay

Closes the relay.

Default: Close Relay (21)

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session out

Indicator that identifies a particular NI-SWITCH session established with the niSwitch Initialize With Topology node, the niSwitch Initialize With Options node, or the niSwitch Initialize node and used for all subsequent NI-SWITCH calls.

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error out

Error information.

The node produces this output according to standard error behavior.

Standard Error Behavior

Many nodes provide an error in input and an error out output so that the node can respond to and communicate errors that occur while code is running. The value of error in specifies whether an error occurred before the node runs. Most nodes respond to values of error in in a standard, predictable way.

error in does not contain an error error in contains an error
If no error occurred before the node runs, the node begins execution normally.

If no error occurs while the node runs, it returns no error. If an error does occur while the node runs, it returns that error information as error out.

If an error occurred before the node runs, the node does not execute. Instead, it returns the error in value as error out.

Where This Node Can Run:

Desktop OS: Windows

FPGA: Not supported


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