Re: [foxboro] CALC block
- From: "Douglas G. Lloyd" <DGLControls@xxxxxxxxxxx>
- To: <foxboro@xxxxxxxxxxxxx>
- Date: Wed, 7 Jan 2004 11:02:09 -0500
Ignacio,
Other list folk have already correctly responded to this question, so I'll
just add my vote for the fact that the CALC block input values will NOT
change during a run from STEP01 to STEP50 as long as the block is coded to
run from top to bottom in a single BPC. If you did something unusual like
take different paths through the logic each scan (i.e. branching), it would
be possible for the values to be seen differently by different steps. But,
NOT if all steps are executed in the same BPC.
Regards,
Doug Lloyd
DGL Controls
-----Original Message-----
From: foxboro-bounce@xxxxxxxxxxxxx [mailto:foxboro-bounce@xxxxxxxxxxxxx] On
Behalf Of IQUEIROLOO@xxxxxxxxxxxxx
Sent: Wednesday, January 07, 2004 8:47 AM
To: foxboro@xxxxxxxxxxxxx
Subject: [foxboro] CALC block
Hi list, I have a question about the CALC block. Suppose that we have a =
CALC block with this instruction in the first line:
Step 1 IN RI01
and the same instruction is repeated in the 40th line, as follows:
Step 40 IN RI01
If the value of RI01 has changed in the time between those two steps in =
the same BPC, the values that the block will read will be different?.
Suppose that the CALC block and the block where the value of the RI01 =
comes from are in the same compound.
Thanks,
Ignacio Queirolo Olivera
Repsol YPF
Tel: +54 221 429-8400 ext. 26481
Fax: +54 221 429-8400 ext. 26272
mailto:iqueiroloo@xxxxxxxxxxxxx
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