Re: [foxboro] a simple challenge
- From: "Stear, Bo" <stear@xxxxxxx>
- To: "'foxboro@xxxxxxxxxxxxx'" <foxboro@xxxxxxxxxxxxx>
- Date: Wed, 21 Nov 2001 16:44:34 -0500
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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