netdomain Posted January 5, 2007 Report Posted January 5, 2007 Hi All, It might sound dumb, but why do we need a Motion Controller CPU, when we can just buy a Position Control Modules for our PLC? For example I am using Q Series PLC, with Q02H CPU And I need a 8 Axis Motion Control System. Should I buy Q Series Motion Controller, or just a Position Control Module ? Quote
Gambit Posted January 5, 2007 Report Posted January 5, 2007 (edited) Well, Depends on your aplication. The advatages of the MotionCPU is more the programming via the software. With the motionsoftware and motionCPU it's very easy to combine axes via virtual main axe(s) use CAM control and many monitoring functionalities. The Speed of the CPU can be a big plus. Using the CPU will probably save you engineering time. The question is more simple than the answer. Edited January 5, 2007 by Gambit Quote
JRoss Posted January 5, 2007 Report Posted January 5, 2007 Gambit hits on a lot of issues, and he's completely right about the application driving the answer. In my mind, it boils down to whether you need coordinated motion. If you're doing a CNC machine, then you should use a dedicated motion controller, so that there are no hitches in the motion. On the other hand, if you are running an assembly line with several axes that don't necessarily need to start/stop at the exact same time, then the control module is adequate. I've programmed a two-axis machine using the QD75M2, and it was pretty straight-forward. I did have significant help from Mitsubishi support, mostly in the form of a demo PLC program that I used as the skeleton for my program. Quote
kosta465 Posted January 6, 2007 Report Posted January 6, 2007 Will you be so kind to share that demo program? I am currently learning Mitsubishi servo myself. Maybe download section? Thanks in advance. Quote
Goody Posted January 6, 2007 Report Posted January 6, 2007 I will second kosta's reply. I have been asked (lol for over a year) to completey strip and renew a glass cutting machine that uses 4 axis's (or is the plural axee lol) At the moment they use an old 386 computer and floppy disks and an old DOS program to put in the coordinates. They know that sooner rather than later this machine is gonna die - it did 3 years ago and we got the last spare part on this earth. I have never done servos before so I would like a heads up before I price for it :) Quote
JRoss Posted January 8, 2007 Report Posted January 8, 2007 (edited) To quote one of my favorite movies: "As you wish!" I knew someone would ask, and should have just dug it up and uploaded it. Laziness, I guess. I used this quite heavily in my development. I did a lot of editing for the final product, but this will get you up and running. Feel free to ask specific questions about the code. EDIT: Should have mentioned that this is only for two axes (that's the plural, BTW), but could easily be expanded. Use manual IN(NA)-0300062-B(0404)MEE for reference. It's available in the Downloads section of Mitsubishi's website. I'm on dial-up today or I'd upload it for you too! Edited January 8, 2007 by JRoss Quote
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