Elmo DSP 402 manual 12.3Functional Description

CANopen DSP 402 Implementation Guide

MAN-CAN402IG (Ver. 1.2)

91

12.3Functional Description

In Interpolated Position mode, the drive executes a time-synchronized motion path. The user specifies the value of the reference signal at an initial time, and at fixed-time intervals from then on (as in the following figure).

P4

	P1		P3
P0
		P2
∆T	∆T	∆T	∆T
T start	Time

Figure 9: Interpolated Motion

In the figure, the time interval ∆T is set by the object 0x60c2, in milliseconds. The data records P0,P1,P2,… (object 0x60C1) to define the motion path data relating to the times

Tstart ,Tstart + ∆,Tstart + 2∆,...

The motion path is synchronized to the CAN microsecond timer, as set and corrected by the SYNC-Time stamp mechanism.

The user must specify the data records P0,P1,P2,…fast enough – at an average rate of at least one record per ∆T . The drive can store up to 64 records, so that the path may be programmed in bursts in order to relax the feeding real-time requirements.

In order to enter IP mode, use the controlword (0x6040) to start the motor, and then use the modes of operation(0x6060) object to select IP mode.

You can monitor the mode using the statusword (0x6041) and modes of operation display (0x6061).

The interpolation sub-mode in object 0x60C0 determines the type of interpolation performed.

The Elmo drive supports two types of interpolation:

Linear interpolation (default)

Cubic spline interpolation

The structure of the 0x60C1 object depends on the interpolation sub-modes. Refer to the definition of 0x60C1 to learn more about sub-mode switching.