PCI-7730 does not move in the order of driving different directions?

I have a 7330 motion control card that I'm driving a shaft on both (so never 1 d moves). I need to be able to move in both directions, which is fairly easy to do using a change (modified to include the limits and home) example VI (I think it was the example of 1 d linear motion). To effectively run my stepper motor for my application, in step/direction mode, when moving to the direction of stage negative (for me it is the 'Blue' in my dye laser) I need to overshoot and then come back so that the engine always ends with a movement from the red. I tried several solutions to this problem, including:

1. in a VI copy/paste on the screws under necessary motion in order, but specify a 'number of steps to move' for the second piece

2. call the same Subvi sequentially (so rather than a long VI a VI with calls to conduct main proposal sub - VI) with various implementations of delays and sequencing

The problems I encounter are:

When using a single move VI (then go one direction up to the complete removal), I can almost always move properly, be it positive or negative direction. Occasionally, and especially when you try to go in a different direction than the previous move, the engine is not. I can watch it on my oscilloscope monitoring steps returned by the engine. The stages of start-up, but about 4 pulses in the VI closes with no error reported (and with the release of that word because, it seems that the program thinks that the move is successful). However, when you use the VI that he calls one way and then the other, I can * never * get the second move (the opposite of the direction) to happen. In 20 years, I even put delays between them in a structure of flat sequence without result. However, I can move one direction, and then immediately the same direction successfully with the same code.

I can't find a 'free channel' or the ability to set regardless of the behavior of management (for example, direction set out to a negative displacement before the negative move, then reset for a positive move before the move is necessary in fact). It is quite possible, Miss me a crucial part in my VI main motion, but then I think that the repeated movements of single direction would fail more frequently.

Is there a way to define the direction prior to a move? Or has anyone else encountered this problem and found a solution more "elegant"?

Thank you!

A. Berke

Note: in order to generate enough current to power my motor (it has optically entered remote), I added my own resistance to the stage and the wiring of the direction as they head towards the engine.

I solved this in case someone else has a similar problem. It turns out that he should be careful with the card ID. It can only be called once (so multiple calls to secondary screws using the same ID Board in a "main" program does not work unless the ID is passed to higher level) in a program.

Tags: NI Hardware

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