RSLogix 5000 Calculate Cam Profile

[Peter Nachtwey]

It looks to me like you are only moving the master 1 degree and resetting back to zero instead of indexing through the whole 360 degrees of the table.

 

[kamenges]

Is it possible you have configured your virtual master axis with a rollover value equal to 1?

Keith

 

[MATT116]

Is it possible you have configured your virtual master axis with a rollover value equal to 1?

Keith

Yes that's what it was.
I had the:
Conversion Constant at 8000.0
Position Unwind at 8000
I now have position unwind at 2880000 (360*8000) and the rotary axis is working fine.

 

[MATT116]

Create a UNIT CAM table based on the x = COS(Deg) Where the MASTER units are Deg and the slave units are 1 (watch later how the radius is brought in)

Engage X axis using a MAPC where the Slave Scaling = a (your ellipse X axis Radius)
Engage Y axis using a MAPC where the Slave Scaling = b (your ellipse Y axis Radius) AND the CAM Master lock Position = 270 Deg (the start of a SIN curve)

I was never able to get this working using the scaling, I mean I was able to draw the ellipse but the size ended up wrong.

I was able to get it working by using two MCCP instructions one for the X and one for Y. I then computed the X,Y slave positions using these formulas.
For :
Repeat
MCCP1_CAM[XResultIndex].Slave := XRadius*cos(XStep*3.14/180);
XStep := XStep + DegIncrement;
XResultIndex := XResultIndex + 1;
Until (XStep >=360)
end_repeat;

For Y:
Repeat
MCCP2_CAM[YResultIndex].Slave := YRadius*sin(YStep*3.14/180);
YStep := YStep + DegIncrement;
YResultIndex := YResultIndex +1;
Until (YStep >=360)
end_repeat;


Thanks for everybody's help

 

[MichaelG]

glad you ended up making it work

time zones are a pain for quick response


The idea behind the slave scaling is that the CAM slave position ranges from -1 to 1 and the slave scaling is used as a multiplier in the units of the slave axis to give the ellipse radius

 

[MATT116]

glad you ended up making it work

time zones are a pain for quick response


The idea behind the slave scaling is that the CAM slave position ranges from -1 to 1 and the slave scaling is used as a multiplier in the units of the slave axis to give the ellipse radius

I've been put on another project for the next two days then I have to go out of town next week but when I get back I'll look into the scaling more.

I knew I need to use a virtual axis as my master but I wasn't sure how. When I read your suggestion about making it a 360 rotary, that made it all come together for me.
Thanks!

 

[Themoonlight]

Hi All
I have an issue with one of my PLC task using Rockwell automation motion control and wondering if you can help me with it!
The task is creating a complex speed using CAM profile for programming the speed of PF527 Drive, it is actually two PF527 always work together on same direction.
I am using MATC instruction to do this task but I am facing an issue.
While I pause the instruction, everything will stop as required, however, when I resume the cam profile will run all over from zero. I am looking for some help / advice on how can I program the MATC so I can stop the profile (or “pause” it) without starting the whole profile from the beginning. I do not have that much experience with motion control, and actually this is my first task therefore any help or support would be highly appreciated.

 

[MATT116]

I'm not at my computer right now so kinda guess but you probably have to use another instruction pointed at the MATC to pause and resume it

 

[Themoonlight]

Thank matt for your response. Can you please clarify more? Is there any specific instruction ?