Open loop with nestedLineStyle

Hi,
Could someone confirm, that InDesign will go into open loop if
app.findTextPreferences.appliedCharacterStyle = charStyle;
and in some story, some paragraph(s) has this charStyle set as a nestedLineStyle further then from 1st line
(from 2nd and next)
i.e setting looks like:
[None] for 1 line
charStyle for 2 lines
My ID CS5 gone out of memory with that...
Only way to run is place mouse insertion point somewhere inside "charStyle" range of text.
Did you notice that also?
rgds
PS
I mean when story.findText() is run from script not from UI
Message was edited by: Jump_Over

Thank you Jasper S.
I think you understand me well.
I tell you more informations.
1) The computer is working in Windows XP Professional (Just Theme).
2) It happens also at low velocity and acceleration.
3) I think when the motor stops moving, it fails to translate into hardware steps.
Because when the motor stops, "Current Trajectory Position" and "Encoder Counts" are equal.
4) I checked status registers on the card when it works abnormally, but can't find any error message and flgs.
5) To make matters worse it happens occasionally, so it's difficult to find out the reason.
6) Strange as it may sound, when I touch the motion connector correctly, the abnormal behavior frequency decrease.
So I tried to exchange a new motion b/d and a motion cable but it was just same error situation.
I can't understand because I just use "OPEN LOOP", it is no matter whether servo driver works well or not.
7) Do I have to change PC? I already tried to exchange PCI Slot position.
I need more information about this.
I'm in trouble because this system is operating at foreign country.
It is fatal error even if it happens once per day....
Please help me once more. Thank you.

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Difference between open loop and closed loop mode when finding the index on a stepper motor axis.

I have a test system which uses a PXI-7352 motion controller with a MID-7602 stepper motor drive to position a 200 step/revolution stepper motor with an attached 1000 line encoder. The MID-7602 is configured for 64 microsteps per step, giving 12,800 microsteps and 4000 encoder counts per revolution. The system is controlled using LabView 7.1 and NI-Motion 6.13. To home the motor, I've defined a sequence in MAX which first finds the reverse limit switch and then moves forward to the encoder index pulse.
When finding its reference in open loop mode, the system its reference at the same microstep each time. When findings its reference in closed loop mode, the system finds its reference somewhere within about a 20 microstep wide range.
I hope somebody out there with more experience with this controller can describe the difference between finding the encoder index in open loop mode and finding the encoder index in closed loop mode.
Thanks,
Mark Moss

Hello Mark,
I suspect that the behavior you are experiencing has today
with the resolution difference between your encoder and your
microstepping. Let me illustrate with an
example:
Example Setup
Stepper
Motor
NI
Motion Controller
10
steps per encoder pulse (Every 10 steps the controller gets an encoder
pulse, therefore positions 0-9 all appear to be 0 to the controller)
The
system has a maximum of 3 pull in moves set
Open Loop Scenario
The
system is commanded to go to position 9.
The
controller sends out 9 pulses.
The
motor moves to position 9.
Closed Loop Scenario
The
system is commanded to go to position 9.
The
controller sends out 9 pulses.
The
motor moves to position 9.
The
controller checks its position and sees that it is still at position 0
because it has not received an encoder pulse.
Because
the controller thinks it is still at position 0, it sends another 9 pulses
as its first pull in move.
The
motor moves to position 18.
The
controller checks its position and sees that it is at position 10 because
it has only received one encoder pulse.
Because
the controller thinks it is still at position 10, it sends1 reverse pulse
as its second pull in move.
The
motor moves to position 17.
The
controller checks its position and sees that it is at position 10 because
it has only received one encoder pulse.
Because
the controller thinks it is still at position 10, it sends and additional
single reverse pulse as its third pull in move.
The
motor moves to its final position of 16.
I believe something similar is happening with your
application as it looks for the index pulse.
Because the controller does not compensate for what it perceives as
position error in open loop mode, the motor always goes to the same commanded
position. In closed loop mode, the motor
is bouncing around inside the single index encoder pulse trying to find a
certain position.
There are several recommendations I can make towards
correcting this behavior. These
recommendations are in order of effectiveness:
Setup
your system so that there are more encoder counts per revolution than
steps per revolution.
Turn
off pull-in moves by setting them to 0 in MAX.
Use an
open loop configuration.
Play
around with the pull in window in MAX.
Regards,
Luke H

Open Loop Problem of PCI-7344

Dear Partners
I have a big trouble....
Any suggestion would be appreciate!
Here is the hardware and software that I am using
S/W : MAX 3.1.1
           LabVIEW 7.1
           NI Motion 7.0
H/W : PCI-7344
           UMI-7764
           YASKAWA Servo Driver
I've tested my motion B/D step by step
1) Start Max3.1.1 / MySystem / Devices and Interfaces /NI Motion Devices /
       PCI7344(1)/Interactive/1-D Interactive
2) Slect "OPEN LOOP"
3) Input steps : Velocity, Acceleration, Deceleration
4) Input steps : Target Position = 100000
5) Click "Apply"
6) Click "Start"
But sometimes it stops generating steps.
it occurs very very irregularly.
I can't understand because I use "OPEN LOOP"
and "Current Trajectory Position" must increase until "TargetPosion" whether the asis move or not.
Also there is no limit signals..
Please see the image file attached.
It's very simple I control motion b/d with OPEN LOOP MODE.
and, I think the servo Driver works well because command steps and encoder pulses are equal.
Please Help me!!!
Crane
Attachments:
7334error.GIF ‏117 KB

Thank you Jasper S.
I think you understand me well.
I tell you more informations.
1) The computer is working in Windows XP Professional (Just Theme).
2) It happens also at low velocity and acceleration.
3) I think when the motor stops moving, it fails to translate into hardware steps.
Because when the motor stops, "Current Trajectory Position" and "Encoder Counts" are equal.
4) I checked status registers on the card when it works abnormally, but can't find any error message and flgs.
5) To make matters worse it happens occasionally, so it's difficult to find out the reason.
6) Strange as it may sound, when I touch the motion connector correctly,  the abnormal behavior frequency decrease.
So I tried to exchange a new motion b/d and a motion cable but it was just same error situation.
I can't understand because I just use "OPEN LOOP",  it is no matter whether servo driver works well or not.
7) Do I have to change PC? I already tried to exchange PCI Slot position.
I need more information about this.
I'm in trouble because this system is operating at foreign country.
It is fatal error even if it happens once per day....
Please help me once more. Thank you.

Why are my steppers misbehaving in closed loop mode, but work fine in open loop

I have a 7344 controlling a 4 axis prototype machine, which is configured with 50,000 steps/rev and linear encoders providing 50800 counts per inch. The physical properties of the machine are less than perfect (prototype!), so there is a considerable amount of backlash in the hardware (about 0.008" - 0.010").
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An A-B-A test with the only change being to initialise the X & Y steppers in open loop instead of closed loop then 'works' - although the physical positioning of the hardware is unsatisfactory due to the physical characteristics of the prototype machine already mentioned, hence the necessity to run closed loop.
I am inclined to interpret the evidence as suggesting that the 7344 is causing an 'occasional' uncommanded move to zero as a result of some interaction between pull-in moves and commanded position on a system where there is a considerable degree of 'elasticity' between the commanded position and the achieved position allied to a rapid-fire de
livery of blend moves.
This problem can be replicated under versions 5.0.1 and 5.2 of the FlexMotion software.
I can clearly run without bumping into the problem by running open loop, but unfortunately that is not acceptable in this situation. Any ideas, anyone?

Hi, and thanks for coming back so promptly. I think I need to give you some more information - sorry if it turns into a long post!
The system behaviour when it 'misbehaves' is that it starts the anomolous behaviour well clear of any home or limit switch (>6"). When it 'goes wrong', it then slews one or both axes to the zero position. Having arrived at the zero position, it then carries on with the next blend without killing the motor.
The initialisation functions include a seek to home switch, a search for the nearest index point, and a zeroing of the encoder count at the index pulse: hence the zero point is a little displaced from the home microswitch.
I believe that once the system has 'gone wrong', it is stopping at the zero point *not* the h
ome switch.
I have carried out some further tests that may be of help:
If I place a large (1 sec) inter-blend delay in the calling functions, the anomalous behaviour is not noticed. However, the start/stop nature of each move means that this test is knocking the bejezus out of a rather fragile prototype machine, so I can't do this too often!
The encoder positions are being read back on each move cycle and monitored, and they are not showing any anomolous behaviour, so I don't think they are the culprit. I have placed a 'scope on the quadrature encoder inputs and the edges are good and sharp with no real indications of noise.
I could test with a blend factor other than -1 if you think that might be illuminating?"

Error -70006 when using stepper motor in Open Loop Mode

We have a LabView program that runs a test in which a table is rotated. At the end of the test, the table is supposed to rewind. Instead, the following message appears:
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http://digital.ni.com/public.nsf/websearch/29edb56146f274a386256a1c00624310?OpenDocument
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1.-Configure your axis as closed loop stepper in the Axis Conifguration Section in MAX.
2.- In thbe 1-D Interactive Basic panel, kill the motor and click on reset position.
3.- Manually rotate the motor one revolution.
4.- In the advanced panel on 1-D interactive, read the Encoder Value. This is the value you should enter on the Axis Encoder Counts per Revolution under Axis Configuration. Press Apply.
5.- Go back to the 1-D interactive Basic Panel. Change the bullet selector unbder Stepper Loop Mode from Closed to Open. Run a 10000 step move.
6.- When the move is finished, read the encoder counts from the advanced panel. This will tell you how many counts you have in 10000 steps. You can now calculate the stepper steps per revolution by the following formula:
(# of steps per count)*(# counts per revolution) = # steps per revolution.
Your motor should work fine in closed loop stepper configuration now and the error should not appear. Please make sure you are using the latest version of our driver (Ni-Motion 6.0.1)to avoid older firmware errors and fixed bugs from affecting your system. You can get it from:
http://digital.ni.com/softlib.nsf/webcategories/85256410006C055586256BB9002C16DF?opendocument&node=132070_US

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Message Edited by daveTW on 09-28-2006 03:30 PM
Greets, Dave
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Is it possible to use software limits on 7354 board when switching control modes from open to closed or closed to open loop?

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