Emerson 0471-0128-02 manual 9 0x604B vlsetpointfactor, 10 0x604C vldimensionfactor

7.5.90x604B vl_setpoint_factor

This object is used to configure the numerator and denominator of the

vl_setpoint_factor. The vl_setpoint_factor modifies the resolution or directing range of the specified setpoint. It does not influence the velocity limit function and the ramp function. A value of 0 must not be used.

Table 7.45 0x604B vl_setpoint_factor

0x604B	vl_setpoint_factor
Sub-index 0
Access: C		Range: N/A	Size: Unsigned 8	Unit: N/A
Default:	2
Description:	The number of last sub-indexes in this object.
Sub-index 1
Access: RW		Range: -32768 to +32767	Size: Signed 16	Unit: N/A
Default:	1
Description:	vl_setpoint_factor numerator (a value of 0 is not valid)
Sub-index 2
Access: RW		Range: -32768 to +32767	Size: Signed 16	Unit: N/A
Default:	1
Description:	vl_setpoint_factor denominator (a value of 0 is not valid)

7.5.100x604C vl_dimension_factor

This object is used to configure the numerator and denominator of the vl_dimension_factor. The vl_dimension_factor is used to scale the user units so that they can be used in a way that relates to the specific application.

Calculating the vl dimension factor:

Every user-specific velocity consists of a specific unit referred to as a specific unit of time (e.g. 1/s, bottles/min, m/s,...). The purpose of the vl_dimension_factor is to convert this specific unit to the revolutions/minute unit. A value of 0 must not be used.

Velocity [user-defined unit] / Dimension factor [rpm/user-defined unit] = Velocity [rpm]

Table 7.46 0x604C vl_dimension_factor

0x604C	vl_dimension_factor
Sub-index 0
Access: C		Range: N/A	Size: Unsigned 8	Unit: N/A
Default:	2
Description:	The number of last sub-indexes in this object.
Sub-index 1
Access: RW		Range: -32768 to +32767	Size: Signed 16	Unit: N/A
Default:	1
Description:	vl_dimension_factor numerator (a value of 0 is not valid)
Sub-index 2
Access: RW		Range: -32768 to +32767	Size: Signed 16	Unit: N/A
Default:	1
Description:	vl_dimension_factor denominator (a value of 0 is not valid)

The vl_target_velocity object is re-read every new profile cycle. It is scaled to appropriate units using the vl_dimension_factor and vl_setpoint_factor objects and then written to the drive preset reference 1 parameter (Pr 1.21).

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SM-EtherCAT User Guide	45
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