Pin Swap screws up schematic

On 11/17/2011 8:41 AM, Chuck Huber wrote:

On 11/16/2011 03:36 PM, John Friede wrote:

>> On 11/16/2011 1:36 PM, Chuck Huber wrote:

>>> After a pin swap on a resistor, the nets will usually cross over each

>>> other to reach the other pin. All you have to do is rotate the resistor

>>> symbol on the schematic 180 degrees and it'll be fine.

>>>

>>> Enjoy,

>>> - Chuck

>>

>> Rotating the resistor did not work. As a result of the lines crossed,

>> the connections were no longer considered "connected". I did find that

>> moving resistor aside and moving it back "reconnected" them.

 

The only thing I can think of is that the nets were deleted from the

resistor in the process of trying to clean up. A quick example may be in

order. I started with this:

 

>

 

After pinswap on R2 in the board:

 

>

 

One can see in the schematic that the bottom net goes all the way

through the resistor symbol to the hot point on the top pin. The top net

does the same thing. If you move the resistor symbol to the side, it's

easier to see the net connections.

 

After rotating R2 180 degrees with "rotate R180 'R2' " in the schematic

and in the board :

 

>

 

I didn't have to do a ripup or delete nets.

 

HTH,

- Chuck

Thanks Chuck.  I did not try rotate by command line.  I used move to

rotate and saw that the net was no longer connected when I moved it.  I

then ran an ERC which generated errors on the other 20 resistors I pin

swapped.

Maybe a feature request would be to automatically do a 180 rotate on

simple two leaded components.

On 11/17/2011 8:41 AM, Chuck Huber wrote:

On 11/16/2011 03:36 PM, John Friede wrote:

On 11/16/2011 1:36 PM, Chuck Huber wrote:

After a pin swap on a resistor, the nets will usually cross over each

other to reach the other pin. All you have to do is rotate the resistor

symbol on the schematic 180 degrees and it'll be fine.

 

Enjoy,

- Chuck

 

Rotating the resistor did not work. As a result of the lines crossed,

the connections were no longer considered "connected". I did find that

moving resistor aside and moving it back "reconnected" them.

 

The only thing I can think of is that the nets were deleted from the

resistor in the process of trying to clean up. A quick example may be in

order. I started with this:

 

 

 

After pinswap on R2 in the board:

 

 

 

One can see in the schematic that the bottom net goes all the way

through the resistor symbol to the hot point on the top pin. The top net

does the same thing. If you move the resistor symbol to the side, it's

easier to see the net connections.

 

After rotating R2 180 degrees with "rotate R180 'R2' " in the schematic

and in the board :

 

 

 

I didn't have to do a ripup or delete nets.

 

HTH,

- Chuck

Thanks Chuck.  I did not try rotate by command line.  I used move to

rotate and saw that the net was no longer connected when I moved it.  I

then ran an ERC which generated errors on the other 20 resistors I pin

swapped.

Maybe a feature request would be to automatically do a 180 rotate on

simple two leaded components.

On 11/16/2011 1:36 PM, Chuck Huber wrote:

On 11/16/2011 12:24 PM, John Friede wrote:

>> I was doing some pin swapping on sm resistors at the board level.  When

>> going back to my schematic, those lines were now crossed and gave all

>> kinds of ERC errors such as net not connected, etc.  I ended up having

>> to erase and redraw the nets.  Is this typical or am I doing something

>> wrong?

 

After a pin swap on a resistor, the nets will usually cross over each

other to reach the other pin.  All you have to do is rotate the resistor

symbol on the schematic 180 degrees and it'll be fine.

 

Enjoy,

     - Chuck

Rotating the resistor did not work.  As a result of the lines crossed,

the connections were no longer considered "connected".  I did find that

moving resistor aside and moving it back "reconnected" them.

On 11/16/2011 12:24 PM, John Friede wrote:

I was doing some pin swapping on sm resistors at the board level.  When

going back to my schematic, those lines were now crossed and gave all

kinds of ERC errors such as net not connected, etc.  I ended up having

to erase and redraw the nets.  Is this typical or am I doing something

wrong?

After a pin swap on a resistor, the nets will usually cross over each

other to reach the other pin.  All you have to do is rotate the resistor

symbol on the schematic 180 degrees and it'll be fine.

Enjoy,

    - Chuck

Think about it.  How do you expect this to work?

Maybe Eagle could have ripped up the immediate tracks to those pins, but

this is where only you know what you want to do.  You wouldn't want Eagle,

for example, to rip up the nets and auto route them without telling you.

Doing nothing and leaving it for you to clean up is the best alternative.

The DRC will make sure any resulting violations are caught for you to deal

with.  That's a lot better then sortof fixing things, but not in the way

you want, but nothing telling warning you of possible issues.

--

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