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08-07-2019, 01:49 PM
Part-5:
In the re-organisation of the schematic and distribution of it over new sheets, we can encounter a problem if there are multi-element devices whose elements are not all on the same sheet. An example of this is a relay.
A relay can be designed as an all-in-one symbol and thus be a DEVICE that has only one element. This is how the original Eagle library relays are formatted. However, the relay can also be composed of two or more elements: the coil, and as many switches as there are poles. A DPDT relay would have three elements then: the coil, the first switch pole, and the second switch pole. The witch poles are the same SYMBOL as for an identical stand-alone switch, so the symbol itself can be used by several DEVICES. Similarly, the SYMBOL for the coil can be used for other DEVICES, such as inductors. How the coils and switches are named within each device makes it clear on the schematic that they are part of something else.
In our schematic splitting, maybe we have relay contacts on the part we wish to move and the coil for that relay is staying where it is. For this scenario, when we get to the point where the circuit to be moved has been isolated, we close the board, then delete the relay contacts from the isolated circuit. Now we GROUP, CUT, GO, open the new sheet and PASTE the circuit in place. Now we INVOKE the relay contacts by pressing the INVOKE function, and type in the relay name and ENTER. A window opens with the relay elements listed, but with only the contacts highlighted as being available to select. We click on the the first contact and drop it in place, then on the second and place it. The circuit is complete again. Press SAVE.
If we do not do the above step, the circuit PASTE will rename the moved relay contacts to reflect a new relay being added to the circuit and the board and schematic will not be consistent. if this happens, simply delete the renamed relay contacts and do the INVOKE steps above to reclaim the original relay contacts.
Now we open the board again and the board and schematic should still be consistent.
All of this is just a sequence of steps where for a portion the board must be open or closed for consistency to be maintained. Eagle has no provision for a quick solution, but life is an imrpovisation.
In the re-organisation of the schematic and distribution of it over new sheets, we can encounter a problem if there are multi-element devices whose elements are not all on the same sheet. An example of this is a relay.
A relay can be designed as an all-in-one symbol and thus be a DEVICE that has only one element. This is how the original Eagle library relays are formatted. However, the relay can also be composed of two or more elements: the coil, and as many switches as there are poles. A DPDT relay would have three elements then: the coil, the first switch pole, and the second switch pole. The witch poles are the same SYMBOL as for an identical stand-alone switch, so the symbol itself can be used by several DEVICES. Similarly, the SYMBOL for the coil can be used for other DEVICES, such as inductors. How the coils and switches are named within each device makes it clear on the schematic that they are part of something else.
In our schematic splitting, maybe we have relay contacts on the part we wish to move and the coil for that relay is staying where it is. For this scenario, when we get to the point where the circuit to be moved has been isolated, we close the board, then delete the relay contacts from the isolated circuit. Now we GROUP, CUT, GO, open the new sheet and PASTE the circuit in place. Now we INVOKE the relay contacts by pressing the INVOKE function, and type in the relay name and ENTER. A window opens with the relay elements listed, but with only the contacts highlighted as being available to select. We click on the the first contact and drop it in place, then on the second and place it. The circuit is complete again. Press SAVE.
If we do not do the above step, the circuit PASTE will rename the moved relay contacts to reflect a new relay being added to the circuit and the board and schematic will not be consistent. if this happens, simply delete the renamed relay contacts and do the INVOKE steps above to reclaim the original relay contacts.
Now we open the board again and the board and schematic should still be consistent.
All of this is just a sequence of steps where for a portion the board must be open or closed for consistency to be maintained. Eagle has no provision for a quick solution, but life is an imrpovisation.
