want to make cable and harness drawings

oppie wrote on Mon, 30 March 2009 17:44

Is there a simple way to make cable and harnessing diagrams with Eagle?

I

was planning to only make a schematic and only made a symbol. Seems that

the

symbol can not be added to schematic unless it has a package included.

 

Is there any way to have a simple schematic with mechanical layout

included

in the same drawing?

 

Thank you for any pointers to get me going - Oppie

Hello Oppie,

I've run into this myself.  In EAGLE, you must add a device to the

schematic.  A _device is the combination of the symbol, the package

(footprint), and the connections between the two (plus some other settings

and attributes).

The fallout is that you must have a physical model of a device to simply

add it to the scheamtic.  Most other CAD tools I've used don't have this

restriction--at least not to this extent.  Often you have to have the

symbol pin to footprint pad mapping, but the physical model of the

footprint and pads is not required.

In any case, a way around this is to simply have a bunch of dummy packages

with the correct number of pads.  In fact, you could just have one package

with more pads then you'll need and use it for everything.  You'll have to

crate the device in EAGLE but since you don't care about the actual

physical implementation you can just connect without any thought which is

very fast.

This means the pad numbers won't be right, so you might want to set the

"visible" flag on your pins in the symbol to either "none" or "pin".  Then

you won't see the arbitrary, incorrect pad connections.

I hope that helped.

Cheers,

James.

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James Morrison schreef:

oppie wrote on Mon, 30 March 2009 17:44

Is there a simple way to make cable and harnessing diagrams with Eagle?

I

was planning to only make a schematic and only made a symbol. Seems that

the

symbol can not be added to schematic unless it has a package included.

 

Is there any way to have a simple schematic with mechanical layout

included

in the same drawing?

 

Thank you for any pointers to get me going - Oppie

 

Hello Oppie,

 

I've run into this myself.  In EAGLE, you must add a device to the

schematic.  A _device is the combination of the symbol, the package

(footprint), and the connections between the two (plus some other settings

and attributes).

 

The fallout is that you must have a physical model of a device to simply

add it to the scheamtic.  Most other CAD tools I've used don't have this

restriction--at least not to this extent.  Often you have to have the

symbol pin to footprint pad mapping, but the physical model of the

footprint and pads is not required.

 

In any case, a way around this is to simply have a bunch of dummy packages

with the correct number of pads.  In fact, you could just have one package

with more pads then you'll need and use it for everything.  You'll have to

crate the device in EAGLE but since you don't care about the actual

physical implementation you can just connect without any thought which is

very fast.

 

This means the pad numbers won't be right, so you might want to set the

"visible" flag on your pins in the symbol to either "none" or "pin".  Then

you won't see the arbitrary, incorrect pad connections.

 

I hope that helped.

 

Cheers,

 

James.

 

Hello,

It seems possible to create a device with only a symbol as long as the

symbol has no pins. see 'frames.lib'. I did a little test (V4.09) and

this works fine.

And seeing you don't have a package, maybe you could do without the pins

and use wire to connect?

Richard

On 04/01/09 20:10, Richard Herman wrote:

...

It seems possible to create a device with only a symbol as long as the

symbol has no pins. see 'frames.lib'. I did a little test (V4.09) and

this works fine.

You can even work with devices that have no package and symbols that

have pins, if you

  SET CHECK_CONNECTS OFF;

See HELP SET for details.

You'll never be able to create a board from such a schematic, though.

But then again, that's apparently not necessary, anyway.

Klaus Schmidinger

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Thank you all for the replies. This gives me a few ways to try in the

future.

I had to get a drawing out so cheated and drew everything with drawing

objects instead of library parts right on the schematic. Worked but is a

pita as moving a 'part' requires selecting it as a group first...

See attached

    Regards - Oppie