Is it possible to use angular targets PCI-7342?

[RVallieu]

I have a system that control motion of a test platform that is rotated around the axis of the motor shaft.

Hardware: PCI-7342 to handle motion control - with the UMI-7764, PCi-6229 for angular position measurements

It is a quadrature encoder with Z index output.

I'm wondering how the PCI-7342 would receive target commands in absolute position mode, and how the Z pulse alters the position tracking on the 7342 (even though we're reading position for plotting to GUI from the 6229 - I know how that is going to work).

The home is the 0 angular position, and lets say the target is 90 degree CW (with CW being the positive directions for counting the encoder pulses).  Lets say Counts/rev = X

To move to 90 I would have to set the target position = 90 * (Counts/rev)?

If I want to move -90 (or 90 CCW from 0) would I send it -90 * (Count/rev)?

What about when I want to travel to 360? do I set the target at  (Counts/rev) - in this case - does the Index marker reset the count on the 7342 to zero (or whatever value I tell it)?

Let me know if you need more information on this.

Thank you,

Ryan

Message Edited by RVallieu on 11-18-2005 01:42 PM

[S_Kanchap]

Hello Ryan,

Try to set target position Target deg (counts/deg) i.e. target 90deg and counts/rev are 4096 then 90*(4096/360). The marker pulse would not reset the readings.

The absolute mode is like if you move 0 to 160deg and then you set  target 80 deg then the axis will come back to 80 deg it will not move further 80 deg means 160+80=240 deg.

I hope it may help you.

[RVallieu]

Thank you for the reply - that is what I figured it would be, I was just uncertain if the Z - index pulse reset the counter on the 7342.

I would just have tested it and seen for myself but the equipment is at the customer site and not finished assembly yet.

Ryan