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	Sat, 18 Feb 2017 12:25:35 -0800 (PST)
Date:	Sat, 18 Feb 2017 23:25:33 +0300
From:	"Vladimir Zhbanov (vzhbanov AT gmail DOT com) [via geda-help AT delorie DOT com]" <geda-help AT delorie DOT com>
To:	geda-help AT delorie DOT com
Subject:	Re: [geda-help] Please help with multiple-pages schematics
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On Sat, Feb 18, 2017 at 12:27:37PM -0700, John Doty wrote:
> 
> On Feb 18, 2017, at 11:56 AM, Vladimir Zhbanov (vzhbanov AT gmail DOT com) [via geda-help AT delorie DOT com] <geda-help AT delorie DOT com> wrote:
> 
> >> 
> >> On the other hand, we *do* allow the case of a “package” derived from multiple symbol instances. Here, Vasily is trying to use that freedom in a way that appears to make sense in his application.
> > 
> > Not for such cases, anyway. See (2). Such using can get confusing
> > even for the author after a while, especially when schematics are
> > large enough.
> 
> But it can also reduce confusion to have the same pin appear in multiple places. For ACIS on Chandra, in Viewlogic, I had slotted dual opamps with power pins on the opamp symbol. This allowed me to be clear about the rails a particular opamp used for power, important in a complicated system with multiple power rails. But Viewlogic would warn me if I did it wrong and shorted one rail to another.

I don't know if I've understood you correctly, though IMO the same
pin must never appear in multiple places. Never!

> More recently, I’ve been using gschem with Kai-Martin-style separate power symbols for this case. And I did, once, make the mistake of choosing a slot from a component that used the wrong rails for the purpose. The result was subtle misbehavior of the fabricated circuit. My fault, but maybe the tool could help better.

Well, we'll always have some trade-offs.

-- 
  Vladimir

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