Re: [foxboro] GDEV USERL1 Input
- From: "Douglas G. Lloyd" <DGLControls@xxxxxxxxxxx>
- To: <foxboro@xxxxxxxxxxxxx>
- Date: Mon, 21 Jan 2008 16:43:54 -0500
Maks,
The GDEV USERL1 & USERL2 parameters have no affect on the block algorithm
and are available strictly as data stores for an application...
Another interesting parameter along the same line is the OWNER parameter (on
GDEVs and many other blocks). OWNER is a 32 character string with "test and
set" capabilities when used with sequence logic. If an attempt is made to
write a non-blank string (i.e. the sequence block name) to OWNER that
doesn't match the value already there, a system error 18 (OP_ERR) is
generated. Use TO_SYS_ERROR SBX logic in the sequence block to trap the
error 18. If no error is generated, the sequence block is the new "owner"
of the target block. If multiple sequence blocks attempt to write to the
OWNER parameter simultaneously, only one will be successful with no error
18! The OWNER parameter and the ACTIVE parameter (i.e. ACTIVATE XXX WHEN
ALREADY GOTO YYY) of sequence blocks are the only two parameters in IA with
"test and set" capability...
Regards,
Doug Lloyd
DGL Controls
-----Original Message-----
From: foxboro-bounce@xxxxxxxxxxxxx [mailto:foxboro-bounce@xxxxxxxxxxxxx] On
Behalf Of Maks Wilde
Sent: Monday, January 21, 2008 4:06 PM
To: foxboro@xxxxxxxxxxxxx
Subject: [foxboro] GDEV USERL1 Input
Dear List,
Is there any more information available on the GDEV USERL1 input than that
provided in FoxDoc?
I am trying to understand some old sequence code, and why this input is
used.
Does setting the value of USERL1 affect the GDEV block in any way, shape or
form?
We do not have Batch Plant Management or similar. FoxDoc description:
USERL1
User Long 1 is a long integer input that can be used for
application-specific
purposes associated with the device that the GDEV block controls.
Applications such as Batch Plant Management can use USERL1 when
they own the block.
Thanks!
Maks Wilde
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