Lost Consistency

"Jim D" <j.doyle@optosci.com> wrote in message

news:il31ir$4g5$1@cheetah.cadsoft.de...

Hi,

 

I wonder if any one provide assistance.  I have lost consistency on my

board.  I have tried various methods to fix but without success.  I have

run ERC and identified say this error below:

 

"Different connections in IC2B pin OE and pad 4 (GND/ none)"

I interpret this to mean there is a net connection on GND but NOT on pin

OE. However there is deffinately a net connection in my schematic as I can

move the GND symbol or my device (74HCT125D) symbol and see that the net

is connected to both device and ground.

I have also tried deleting devices and nets and added new devices from

library, with no success.  I have also deleted nets and renamed there

another name and still no success.

 

How can I fix this ?

Fixing inconsistancy is easy IF you understand it, but its more complex than

you may think. There is a lot of confusion around on how this works.

First, to resolve a problem, you need to fix the problem AND run ERC again

to get the design into a resolved state. If you "fix" too much, you end up

with different inconsistancies.

To fix your problem you need to go to the board and use the "signal"

command/button and click the pad (hold cltrl while clicking to catch it if

its outside the grid). The second end of the signal can be either:

-a loose end (the pin gets a new netname wich you can rename to GND). Click

on an empty space and left click again to confirm, and esc to end it. You

will now get an airwire cross on the pad (meaning it has a net, but it

doesnt go anywere). You can now do the "name" command on it and you will get

an airwire.

-a second pad or via from the same signal (unfortunately connecting to a

wire doesn't work)

Click ERC again to check if it helped.

I now have Consistency in my design, thank you Morten and all for your great

input.

In the interests of more people having a similar problem, (experienced or

inexperienced) here is what I did.  I had tried to fix as directed by Morten

below but for some reason I could not get the Airwire Cross to appear on the

pad of interest. I could place a signal airwire on the first pad of

interest, but when I double click mouse on empty space + press "esc", no

Airwire Cross would appear.  I tried this dozens of times with no success.

To get round this I tried typing the command directly at the top of the

board window using following structure:

signal (signal name) (device reference) (pin No) (second device reference)

(pin No of second device)

eg1 - signal 7RX1+ X5 C9 SV7 3

eg2 - signal GND IC1 7 IC2 7

Rather than type this for every instance of Consistancy error I used the

arrow keys and the previous entered cammand line appeared then I just simply

edited this line to suit the next error signal.

In the instances where there were tracks already on the PCB but these were

also inconsistant, I pressed the "signal" button and clicked on thefirst pad

with track still in place.  I then dragged mouse, with Airwire still

attached, to second pad and single clicked mouse to attach Airwire.  I then

pressed "esc" to release Airwire from mouse.  Next I pressed "ERC" button.

Hence, particular error was deleted from error list.

Working my way through all errors in this manner resulted in bottom of

schematic or board window displaying message

"board and schematic are consistent"

Many thanks - hope this adds to knowledge base, at least for newbies.

"Morten Leikvoll" <mleikvol@yahoo.nospam> wrote in message

news:il4o1j$4au$1@cheetah.cadsoft.de...

"Jim D" <j.doyle@optosci.com> wrote in message

news:il31ir$4g5$1@cheetah.cadsoft.de...

>> Hi,

>>

>> I wonder if any one provide assistance.  I have lost consistency on my

>> board.  I have tried various methods to fix but without success.  I have

>> run ERC and identified say this error below:

>>

>> "Different connections in IC2B pin OE and pad 4 (GND/ none)"

>> I interpret this to mean there is a net connection on GND but NOT on pin

>> OE. However there is deffinately a net connection in my schematic as I

>> can move the GND symbol or my device (74HCT125D) symbol and see that the

>> net is connected to both device and ground.

>> I have also tried deleting devices and nets and added new devices from

>> library, with no success.  I have also deleted nets and renamed there

>> another name and still no success.

>>

>> How can I fix this ?

 

Fixing inconsistancy is easy IF you understand it, but its more complex

than you may think. There is a lot of confusion around on how this works.

 

First, to resolve a problem, you need to fix the problem AND run ERC again

to get the design into a resolved state. If you "fix" too much, you end up

with different inconsistancies.

 

To fix your problem you need to go to the board and use the "signal"

command/button and click the pad (hold cltrl while clicking to catch it if

its outside the grid). The second end of the signal can be either:

-a loose end (the pin gets a new netname wich you can rename to GND).

Click on an empty space and left click again to confirm, and esc to end

it. You will now get an airwire cross on the pad (meaning it has a net,

but it doesnt go anywere). You can now do the "name" command on it and you

will get an airwire.

-a second pad or via from the same signal (unfortunately connecting to a

wire doesn't work)

 

Click ERC again to check if it helped.

 

 

I now have Consistency in my design, thank you Morten and all for your great

input.

In the interests of more people having a similar problem, (experienced or

inexperienced) here is what I did.  I had tried to fix as directed by Morten

below but for some reason I could not get the Airwire Cross to appear on the

pad of interest. I could place a signal airwire on the first pad of

interest, but when I double click mouse on empty space + press "esc", no

Airwire Cross would appear.  I tried this dozens of times with no success.

To get round this I tried typing the command directly at the top of the

board window using following structure:

signal (signal name) (device reference) (pin No) (second device reference)

(pin No of second device)

eg1 - signal 7RX1+ X5 C9 SV7 3

eg2 - signal GND IC1 7 IC2 7

Rather than type this for every instance of Consistancy error I used the

arrow keys and the previous entered cammand line appeared then I just simply

edited this line to suit the next error signal.

In the instances where there were tracks already on the PCB but these were

also inconsistant, I pressed the "signal" button and clicked on thefirst pad

with track still in place.  I then dragged mouse, with Airwire still

attached, to second pad and single clicked mouse to attach Airwire.  I then

pressed "esc" to release Airwire from mouse.  Next I pressed "ERC" button.

Hence, particular error was deleted from error list.

Working my way through all errors in this manner resulted in bottom of

schematic or board window displaying message

"board and schematic are consistent"

Many thanks - hope this adds to knowledge base, at least for newbies.

"Morten Leikvoll" <mleikvol@yahoo.nospam> wrote in message

news:il4o1j$4au$1@cheetah.cadsoft.de...

"Jim D" <j.doyle@optosci.com> wrote in message

news:il31ir$4g5$1@cheetah.cadsoft.de...

>> Hi,

>>

>> I wonder if any one provide assistance.  I have lost consistency on my

>> board.  I have tried various methods to fix but without success.  I have

>> run ERC and identified say this error below:

>>

>> "Different connections in IC2B pin OE and pad 4 (GND/ none)"

>> I interpret this to mean there is a net connection on GND but NOT on pin

>> OE. However there is deffinately a net connection in my schematic as I

>> can move the GND symbol or my device (74HCT125D) symbol and see that the

>> net is connected to both device and ground.

>> I have also tried deleting devices and nets and added new devices from

>> library, with no success.  I have also deleted nets and renamed there

>> another name and still no success.

>>

>> How can I fix this ?

 

Fixing inconsistancy is easy IF you understand it, but its more complex

than you may think. There is a lot of confusion around on how this works.

 

First, to resolve a problem, you need to fix the problem AND run ERC again

to get the design into a resolved state. If you "fix" too much, you end up

with different inconsistancies.

 

To fix your problem you need to go to the board and use the "signal"

command/button and click the pad (hold cltrl while clicking to catch it if

its outside the grid). The second end of the signal can be either:

-a loose end (the pin gets a new netname wich you can rename to GND).

Click on an empty space and left click again to confirm, and esc to end

it. You will now get an airwire cross on the pad (meaning it has a net,

but it doesnt go anywere). You can now do the "name" command on it and you

will get an airwire.

-a second pad or via from the same signal (unfortunately connecting to a

wire doesn't work)

 

Click ERC again to check if it helped.