Set Breakpoint Output MOMO Sets the breakpoint outputs using the Must On/Must Off protocol. Details

Device Compatibility Device Compatibility 7330 Y 7340 Y 7344 Y 7350 Y 7390 Y NI SoftMotion Controller for CANopen—Accelnet N NI SoftMotion Controller for CANopen—Xenus N

	Must Off is the bitmap of breakpoint outputs to force Off: 1—If true, breakpoint output is forced Off. If false, breakpoint output is unchanged (default). 2—If true, breakpoint output is forced Off. If false, breakpoint output is unchanged (default). 3—If true, breakpoint output is forced Off. If false, breakpoint output is unchanged (default). 4—If true, breakpoint output is forced Off. If false, breakpoint output is unchanged (default). 5—If true, breakpoint output is forced Off. If false, breakpoint output is unchanged (default). 6—If true, breakpoint output is forced Off. If false, breakpoint output is unchanged (default). 7—If true, breakpoint output is forced Off. If false, breakpoint output is unchanged (default). 8—If true, breakpoint output is forced Off. If false, breakpoint output is unchanged (default).
	Must On is the bitmap of breakpoint outputs to force On: 1—If true, breakpoint output forced On. If false, breakpoint output unchanged (default). 2—If true, breakpoint output forced On. If false, breakpoint output unchanged (default). 3—If true, breakpoint output forced On. If false, breakpoint output unchanged (default). 4—If true, breakpoint output forced On. If false, breakpoint output unchanged (default). 5—If true, breakpoint output forced On. If false, breakpoint output unchanged (default). 6—If true, breakpoint output forced On. If false, breakpoint output unchanged (default). 7—If true, breakpoint output forced On. If false, breakpoint output unchanged (default). 8—If true, breakpoint output forced On. If false, breakpoint output unchanged (default).
	Board ID is a unique number assigned by Measurement & Automation Explorer (MAX) used to send and receive commands and data to or from a specific NI motion controller.
	Axis or Encoder is the axis or encoder selector. To set breakpoint outputs on multiple axes, use 0 (zero). To set breakpoint outputs on multiple encoder resources, use 0x20.
	Inp Vect indicates the source of the data for this VI. Specifically, Inp Vect inputs the location of the Must On parameter. The Must Off is simply the next onboard variable location. Inp Vect is not a bitmap of the breakpoint outputs. Refer to Input and Return Vectors for more detailed information.
	error in (no error) describes error conditions that occur before this VI runs. The default input of this cluster is no error. If an error already occurred, this VI returns the value of error in in error out. The VI runs normally only if no incoming error exists. Otherwise, the VI passes the error in value to error out. The error in cluster contains the following parameters: status is TRUE if an error occurred before this VI was called, or FALSE if not. If status is TRUE, code is a nonzero error code. If status is FALSE, code is zero or a warning code. code is a number identifying an error or warning. If status is TRUE, code is a nonzero error code. If status is FALSE, code is zero or a warning code. Use the error handler VIs to look up the meaning of this code and display the corresponding error message. source is a string that indicates the origin of the error, if any. Typically, source is the name of the VI in which the error occurred.
	Bd ID Out is provided for flow control. You can string together NI-Motion VIs by wiring the Board ID Out terminal of one VI to the Board ID terminal of the next VI.
	Resource Output is the Axis, Vector Space, ADC, or Encoder you wired into the VI. Use Resource Output to pass the resource to another VI and/or to display information about the device.
	error out contains error information. If error in indicates an error, error out contains the same error information. Otherwise, it describes the error status that this VI produces. status is TRUE if an error occurred, or FALSE if not. If status is TRUE, code is a nonzero error code. If status is FALSE, code is zero or a warning code. code is a number identifying an error or warning. If status is TRUE, code is a nonzero error code. If status is FALSE, code is zero or a warning code. Use the error handler VIs to look up the meaning of this code and display the corresponding error message. source is a string that indicates the origin of the error, if any. Typically, source is the name of the VI in which the error occurred.

Using This VI

The Set Breakpoint Output MOMO VI directly controls the breakpoint outputs and sets them high or low. You can use this VI to set breakpoint outputs to a known state or to control them as general-purpose outputs in non-breakpoint applications. You can only control the output using this VI if the breakpoint is disabled.

Note  The Set Breakpoint Output MOMO VI only affects the output state of the breakpoint. It does not change the breakpoint status.

Breakpoint functionality is performed by the encoder resources themselves. When this VI is sent to axes, the NI-Motion firmware consults the mapping of axes to encoders and actually sends the command to the mapped encoder resources. Breakpoints are only available on encoder resources. Refer to Encoders for encoder resource IDs.

Using the Must On/Must Off protocol allows you to set or reset individual breakpoint outputs without affecting the other breakpoint outputs. This gives you tri-state control over each output: On, Off, or Unchanged. A True in a location of the Must On bitmap sets the breakpoint high, while a True in the corresponding location of the Must Off bitmap resets the breakpoint low. A False in either bitmap has no effect, so leaving both the Must On and Must Off bits at zero is effectively a hold, and the state of the breakpoint output is unchanged. If you set both the Must On and Must Off bits to True, it is interpreted as a Must On condition and the breakpoint is set high.

Note  If the breakpoint is enabled using the Enable Breakpoint Output VI, you cannot change the output value using Set Breakpoint Output MOMO. The command is ignored by the motion controller.

Note  The first input vector source indicates the value for the Must On input and the second vector source indicates the value for the Must Off input. It is not a bitmap of the breakpoint output. If you are doing onboard programming and are using Inp Vect to get the data this VI needs, remember that this VI reads the variables starting at the memory address pointed to by Inp Vect in the following order: Must On, Must Off.