Re: [foxboro] One more question...

Welcome to the fold Steve,=20

You'll see that you'll be working with a magnificent animal - which has
it's own quirks no doubt about that. I've been working on and with it
since the pre-release software days, oh 1986 if I recall rightly. It can
best be regarded as a humongous toolbox with every toy you can possibly
wish for. HOWEVER, as for the question regarding standards - naaaaah -
that's one thing it never had.=20

For a lot of it - you make it up as you go or nurture/dump what somebody
left you and use this site well - a decent bunch of people...

And yes, the block used to be called the generic device block but had a
bit of a name change somewhere along the way.

Kind regards
Anton Prinsloo
Control System Superintendent
Zinifex Century Mine

-----Original Message-----
From: foxboro-bounce@xxxxxxxxxxxxx [mailto:foxboro-bounce@xxxxxxxxxxxxx]
On Behalf Of Jones, Charles R. (Chuck)
Sent: Thursday, 28 December 2006 11:08 AM
To: foxboro@xxxxxxxxxxxxx
Subject: Re: [foxboro] One more question...


On 12/27/06, Stephen Ziegler <stephen.m.ziegler@xxxxxxxxx> wrote:
> Sorry all, I meant to include this in my last post.  What exactly is a

> "GDEV"?  From reading the posts, it sounds like a DCM from =
Siemens=3D20=20
> TXP. What is the standard symbol for this?

And Jeremy Milum wrote:
> It is a General DEVice block. It can be used for valves, motors,
pumps, etc.

To which Chuck Jones adds (humbly):
Previous to this block (and still in existence) are more blocks for
specific digital devices:
MOVLV for motor driven valves
MTR for motors
VLV for pneumatic valves

The GDEV (I've often wondered if "Generic" DEVice block might be more
descriptive) block combines these different blocks into one generic
block.  This combined functionality is an asset when sequence blocks
have been written for years when a digital device of one type is
replaced by another.  (We recently changed one very large pneumatically
operated digital valve with a motor driven valve without having to
change the sequence code because the controlling block, a GDEV, did not
change.)  Another advantage--especially for beginners--is that you can
get by with learning one block instead of several.
=3D20
=3D20
I hope you like the your new system.  The rest of us here really like it
(pretty much all of the time!).

Cheers,
Chuck Jones
Automation Technologist
Tate & Lyle -- Lafayette Plant
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