Richard,
I don't have an answer for you, but I can provide some thoughts.
First, I use a lot of sequence code, but I always try to use continuous
control blocks (like the CALCA block) where the solution fits. If some of
the block parameter connections can not be secured because they need to be
changeable by different things, then sequence code probably needs to be
used. The continuous control blocks are more deterministic.
If you use a sequence block to set an external parameter, then your code
should probably wait a few seconds and then read the status back to confirm
it was changes. It will be more efficient if the sequence blocks input
parameters are connected to the external block parameters that you want to
monitor.
If you want values to sometimes be set by the code, and other times be
able to change the value via graphics, please note that the CALCA block has
the SEC instruction that can secure (i.e. set=T) an output parameter to be
changed only by the CALCA block, and the REL instruction to unsecure (i.e.
unset=F) the parameter to enable its value to potentially be changed by
other things like graphics.
The CALCA block OSP (One Shot Pulse) can be used to pulse an output
connection to the ACCUM block's CLEAR parameter if you want to zero the
totalizer counter value based on some condition.
Neil Martin
Huntsman Performance Chemicals
From: "Richard Henry" <dmarc-noreply@xxxxxxxxxxxxx> (Redacted sender
"richardhenry73" for DMARC)
To: "foxboro@xxxxxxxxxxxxx" <foxboro@xxxxxxxxxxxxx>,
Date: 02/27/2017 02:06 PM
Subject: Re: [foxboro] Sequence logic
Sent by: foxboro-bounce@xxxxxxxxxxxxx
Hi Folks,
My apologies let me try this again. Whats happening is rpm's are fed into a
accumulator block and at certain counts will equal so many a revs. this is
on a digester swinging softwood to hard wood and as the species of wood
comes into the system at certain counts we want fill factors changed and
ratios/ spts changed and when we want to be able to clear the counter
after a swing. So this is some of what we are doing weather to use calc
blocks or sequence blocks. So If anyone has any logic with this sort of
logic I would be greatly appreciated. I hope this explains my self better.
Thanks,Richard
On Monday, February 27, 2017 2:34 PM, Joseph M. Riccardi
<Joe@xxxxxxxxxxxxx> wrote:
Richard,
May I suggest you be more specific about your application and I am sure
many
on this list would be eager to send you great examples...
Joseph M. Riccardi
386-451-7607 Cell
Â
Joe@xxxxxxxxxxxxx
Â
"To give real service you must add something that cannot be bought or
measured with money; and that is sincerity and integrity." - Donald A.
Adams
-----Original Message-----
From: foxboro-bounce@xxxxxxxxxxxxx [mailto:foxboro-bounce@xxxxxxxxxxxxx] On
Behalf Of Richard Henry (Redacted sender "richardhenry73" for DMARC)
Sent: Monday, February 27, 2017 2:27 PM
To: Foxboro Mailing List <foxboro@xxxxxxxxxxxxx>
Subject: [foxboro] Sequence logic
I am currently looking at using sequence logic blocks to watch the rpms
increase and decease I want to have spts be modified and to change parts of
calculations in certain calc blocks. My question may be way to vague but
does anyone have any modified logic that I may look at to see how some of
these such ideas may be achieved as I am not as accustomed to sequence as I
am calc blocks. Any help will be appreciated.
Thanks,Richard
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