Re: [foxboro] a simple challenge

Not necessarily better, as there are many ways to accomplish things, but 
another alternate:
I have had to deal with a varying array of valves and one with multiple 
COUTs with multiple valves which could not be handled with single GDEVs  by 
using a script and the setb call to manipulate  COUT blocks for x amount of 
time (with sleep) before closing them and opening others.
E.g.:
setb COMPOUND:BLOCK.COUT 1
sleep 10
setb COMPOUND:BLOCK.COUT 0.
This script was executed from a graphic and I echoe'd feedback to the top 
line of the screen so we could tell what was happening.
Just keep in mind the security of doing this on the WP or AW vs. on the CP 
itself. This has worked well for years without a hitch though.

Sincerely,
Diane B. Harris
Harris Automation Services, Inc.
http://www.HarrisAS.com



----Original Message Follows----
From: "Stear, Bo" <stear@xxxxxxx>
Reply-To: foxboro@xxxxxxxxxxxxx
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Subject: Re: [foxboro] a simple challenge
Date: Wed, 21 Nov 2001 16:44:34 -0500
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Better yet, have a look at the capabilities of the STATE block.  Sequencing 
of outputs for valves as you describe can be done easily here.

-----Original Message-----
From: kevin.fitzgerrell@xxxxxxxxxxxx
[mailto:kevin.fitzgerrell@xxxxxxxxxxxx]
Sent: Wednesday, November 21, 2001 3:36 PM
To: foxboro@xxxxxxxxxxxxx
Subject: Re: [foxboro] a simple challenge




Michael,

If I understand correctly you want to trigger a series of solenoid valves
in sequence every X seconds.  Each solenoid valve to stay open for Y
seconds, with the next solenoid valve in sequence to open as the prior one
closes.

I'd probably do the logic in a CALCA or CALC block.  Something like this
ought to work.  BO01 - 4 are outputs to drive solenoids.  I'd just use COUT
blocks or an MCOUT connected to BO01-4 to drive simple solenoids.

type = CALCA
period = 2 (execute each second)
ii01 = seconds between cycle repeats
ii02 = seconds for each solenoid
timini = 1 (so OSPs don't trigger on initialize)

1  in ii02
2  stm m01   ; store SV on time in mem for osp
3  inc io01
4  in io01   ;
5  in ii01   ;
6  sub
7  bip 11    ; on new cycle go to init
8  clr bo05  ; otherwise clear cycle flag
9  gto 13    ; and skip initialize
10 clr io01  ; initialize second counter
11 set bo05  ; set in cycle flag
12
13 in bo05   ; on bo01 to 1
14 osp m01   ; generate signal for SV 1
15 out bo01
16 in ~bo01  ; on SV1 finish
17 osp m01   ; generate signal for SV 2
18 out bo02  ;
19 in ~bo02  ; on SV2 finish
20 osp m01   ; generate signal for SV 3
21 out bo03  ;
22 in ~bo03  ; on SV3 finish
23 osp m01   ; generate signal for SV 4
24 out bo04
25 end
27

Regards,

Kevin FitzGerrell
Systems Engineer
Foxboro New Zealand
------------------------------------
Tel:  +64 (9) 573 7690
Fax:  +64 (9) 573 7691



                     mvandenberg@xxxxxx
                     Sent by:                 To:     foxboro@xxxxxxxxxxxxx
                     foxboro-bounce@fre       cc:
                     elists.org               Subject:     [foxboro] a 
simple challenge


                     11/21/01 08:24 PM
                     Please respond to
                     foxboro







Hi list,

We are going to replace a local relay / timer driven filter cleaning
sequence by "something" in I/A.
We therefore need to separately activate 4 solenoids, one after the oth=
er,
for a variable number of seconds (most likely 2). The interval between
activating the solenoids should also be variable.
I have already made something with a Calc block that generates seconds =
( 0
to 62) connected to a AIN block. On the four boolean alarm limits I
connected the solenoids using a GDEV with the pulse option on. But ther=
e
must be something more brilliant than this, without the use of a DEP bl=
ock.
The solenoids will be connected (2?wire) to FBM41C/42C, therefore a PLB=

solution is an option.
All suggestions are more than welcome.

thanks,

Michel




Michel van den Berg
PFW Aroma Chemicals B.V.
PO Box 415
3770 AK Barneveld
the Netherlands

Phone : (31)342 - 407 791
Fax   : (31)342 - 407 789
email : mvandenberg@xxxxxx
FedEx : Nijverheidsweg 60
         3771 ME Barneveld
         the Netherlands







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