Set Up Motion Control in a Micro850 for Servo Positioning
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- Опубліковано 31 сер 2021
- In this lesson we show how to use the motion instructions in Connected Components Workbench to do motion control with the Allen Bradley Micro850 PLC. We use the MC_ReadAxisError to determine the current state of our axis, the MC_Power instruction to enable the motion axis, the MC_Home instruction to set the home position of our axis, MC_MoveVelocity to jog the axis manually, the MC_Stop to stop the motion axis, and the MC_MoveAbsolute to precisely position the axis.
Get the full details of this lesson at twcontrols.com/micro800-conne...
Items used in this video:
PLC Trainer twcontrols.com/plc-trainers
Stepper Trainer controls.tw/steppertrainer
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Thanks for everything, greetings from Mexico
You are welcome!
Excellent video as always..
Glad you enjoyed it!
Tim, I'm working with a micro850. your tips helped a lot! I managed to get the axes to work. but I need to do the acceleration and braking curve. can you help with that? thanks
Dear Tim, Good day, Interesting and great Video, Thank you, I want to know using MC_MoveRelative instruction, can do a continuous movement taking different positions X-axis values, like x=2mm, x=3mm, x=10, x=15 , x= 12, X= 16 ETC? if so I kindly request you how can program using CCW ?
Please make video on power monitor 1000 communicate with control logix and panel view C300
Tim,
As always, thank you for the great video.
I have been working on a stepper motor project of my own using the "motion controls" function blocks within Connected Components Workbench, but have been unable to figure this one feature out. I cannot get the stepper motor to change velocities based off an analog input in real time.
On the MC_moveVelocity command, the velocity variable value is changing (which is the analog input value), but the speed doesn't actually change until I disable and re-enable the MC_MoveVelocity "Execute" boolean variable. I can see the velocity variable changing in CCW, but the motor speed never actually changes until the toggling action just mentioned occurs. I would prefer a continuos solution, where the if the analog value increases, then the motor speed increases automatically.
Do you have any idea on how to do this? I tried using the MC_WriteParameters function, but nothing has come about. Any help would be greatly appreciated.
Hum...I think you'll need to use a move position with a very large final position. They allow updates to the velocity without stopping. I haven't tried to do that.
Hi Tim, What happens if my home switch sensor fails? What can I do to the motor stop if it did not find its sensor?
The overtravels should stop it.
Tim: Is there a way to export CCW software to RSLogix 5000 Studio? Have one at home, and the other at school. Thanks
Not that I'm aware of Richard but you can copy and paste in between them which is a HUGE improvement.
How would you do the programming side (RSLogix5000/Studio 5000) on a CompactLogix L33ERM ? There's alot of people on the web talking about special driver (AMCI stepper module) to buy but if we want to hook it up to cheap TB6600 driver, how to control those ??
I'm only aware of the AMCI option and I've never used it.
(at 3:03) Electrical Question: When you connected the "ENA+" to the PLC output, is there a concern with the limit switches already carrying +24V from that "ENA+" connector and then backfeeding +24 into the PLC's output? (because I'm overly cautious with this, I put a diode on the PLC output, but it would be good to know if this is a concern or not). Thanks!
It can be a concern, especially on inductive coils, big contactors and solenoids are the worst. But not in this case. I should do a video on that sometime.
How would you read the current position in CCW, to be able to display it (like on a PV800 display screen)? Thank you, I love your videos!
Hi Michael, yes, you could set it up to display like any other tag, have you seen our Panelview 800 videos?
ua-cam.com/video/RZVDuDEqVfA/v-deo.html
Thank you for a great video, as always. I'm confused though about the timer - I don't see how it's doing anything. Nothing is contingent upon it being completed. At around 40 minutes, you add a rung that you say is for checking that the home delay is done (it becomes true) - but that will happen as soon as it latches in the rung above (well, when that cycle processes). The timer is in parallel with it, so the latch delay being done should be independent of the timer. Am I missing something?
It just makes the home stay on a little longer. I had some timing issue but I can't recall, I haven't played with that trainer in a while.
Hi Tim, good video as always, do you know why my Stepper is only going Counter Clock Wise, and I can´t move it the oposite way? I am changing the direction sign from negative to positive but nothing happens on the move relative module. Thanks
Hi Daniel. What do you mean by you are changing your direction signal from negative to positive. Most steppers have a pulse for the speed, which I assume is correct, and a direction which you apply power to when you want to reverse direction. You may see a DIR+ and a DIR- but you would still apply voltage across them when you want to reverse direction.
I see that model only has 4 High speed outputs. Does the direction and the pulse both need to be on a high speed output? I want to connect 3 axis to this setup to make a router. Thanks!
Two only and you wouldn't want to use it for a router. It can't do circular interpretation.
Your videos have been extremely helpful.
Any future plans to do a similar video with the 5100 series Knitex drives and TLP motor?
I did this one on the 5100 and we're building a custom Kinetic 5300 now, well probably do some videos on it.
ua-cam.com/video/1fpK1pbjbK0/v-deo.html
@@TimWilborne thanks….
I started my journey into plc programming last winter after purposely staying away from it for years.
Kicking my myself for not doing it sooner. Worked with relay logic forever.
Your videos have really bridged the gaps in my knowledge base.
@@gibbeys I am glad to hear that they have been helpful!
I want to build something like this , will CCW work with a stepper motor and driver ?
Yes, you should be able to make it work with the Micro850.
I gave the movevelocity command and worked perfectly. When I gave a stop command for an estop that worked perfectly but couldn't reissue the movevelocity after that. I tried mcreset and still no luck. Anyone have any ideas or thoughts on what my problem might be?
I think in that case you have to disable and re-enable the axis.
I cannot find the video about the software you are using, I have a controllogix and I want to connect a stepper motor to it, how can I do that using rslogix ? Thank you
There is no native way to do this with a Controllogix
Hi Tim, would like to ask you. The motion axis TargetPos or CommandPos can it be reset after maybe 100 incremental cycle running?
It has to complete the move before you can put in another value.
@@TimWilborne yes. But if is incremental. The value will keep adding until it overflow right? How to prevent it to happen?
Yes, eventually you do have to "roll over" your encoder. That would make for a good video.
@@TimWilborne but I’m using pulse and direction to move the position with incremental. Is that I need to use the MC_setPosition to make it the value to zero?
Sorry Tim but you loose me with all that spaghetti.
My programming code or the wiring 😂Here is the first video in the series of how it was wired.
ua-cam.com/video/rMVIuYhvr9g/v-deo.html