Re: [foxboro] DM relative picks and dm variables question

Re: Case sensitivity in DM Variable names
The DM is case insensitive to its DM variable names. Thus, the DM
variable DMCMD can be used as DMCMD or dmcmd. The upper case form is
preferred.

As an aside, for those DM global variables that are implemented as OM
variables, the full name is <dmName><varName> where:

<dmName> is the DM name in UPPER case and
<varName> is the DM variable name in UPPER case.

The OM is case sensitive.


So, the DM variable DMCMD in WP0001 may be referenced as dmcmd or DMCMD
in a DM script, but if the OM is used to access it, the reference must
be to WP0001DMCMD not wp0001dmcmd.


Re: Your overlays
The reason the overlays are built using different variables is that the
designer was providing support for multiple overlays to be raised at the
same time.

If the same DM variables, e.g., P1 and P2, were used in all of your
overlays only one of them could be "up" at the same time.


I've never done it, but I understand that you can work around this issue
with FoxView. I believe the approach uses the alias feature. Perhaps
someone else can explain the mechanics of the mechanism.



Regards,

Alex Johnson
Invensys Systems, Inc.
10900 Equity Drive
Houston, TX 77041
713.329.8472 (voice)
713.329.1700 (fax)
713.329.1600 (switchboard)
alex.johnson@xxxxxxxxxxxxxxxx


-----Original Message-----
From: foxboro-bounce@xxxxxxxxxxxxx [mailto:foxboro-bounce@xxxxxxxxxxxxx]
On Behalf Of Wilson, Brad
Sent: Friday, January 11, 2008 8:41 PM
To: foxboro@xxxxxxxxxxxxx
Subject: [foxboro] DM relative picks and dm variables question

I'm working on a project that has 4 copies of every quarter-screen
overlay. All the overlays are configured for position 1 (UL) and the
quadrant is defined in the ov command. My question is about the relative
picks used when opening these overlays. The overlay to be used in UL
uses p1:p2 for C:B, while the UR overlay uses p4:p5, LL overlay uses
p7:p8, and LR overlay uses p10:p11. Is this a requirement that the same
overlay in different positions must use different variables to avoid
confusion on the screen? I thought these variables were run-time
substitutions.
 =


In addition, I find many overlays that use P1/P2 (capital letters)
instead of p1/p2, and others that use P1/P2 in addition to p1/p2, even
though the capital variables are not set in the dmcmd call. These appear
to be sloppy overlay configuration, but it seems that DM is able to
translate the upper-case to lower-case on the fly, because I'm not
getting smurfed connections in the overlays.

 =


Brad Wilson

brad.wilson@xxxxxxxxxxxxxxxx

Invensys Process Systems, Inc

1090 King Georges Post Rd, Suite 204

Edison, NJ  08837

732-661-4012 o

732-874-0087 c

 =


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* Confidentiality Notice:
This e-mail and any associated files are intended solely for the individual=
 or entity to whom they are addressed. Please do not copy it or use it for =
any purposes, or disclose its contents to any other person. Further, this e=
-mail and any associated files may be confidential and further may be legal=
ly privileged. This email is from the Invensys Process Systems business uni=
t of Invensys plc which is a company registered in England and Wales with i=
ts registered office at Portland House, Bressenden Place, London, SW1E 5BF =
(Registered number 166023).  For a list of European legal entities within t=
he Invensys Process Systems business group, please click here http://www.in=
vensys.com/legal/default.asp?top_nav_id=3D77&nav_id=3D80&prev_id=3D77.

If you have received this e-mail in error, you are on notice of its status.=
 Please notify us immediately by reply e-mail and then delete this message =
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