Re: [foxboro] FBM241 - input pulse rate
- From: Dirk Pauwels <dirk.pauwels@xxxxxxxxxx>
- To: "foxboro@xxxxxxxxxxxxx" <foxboro@xxxxxxxxxxxxx>
- Date: Wed, 18 Apr 2012 13:12:43 +0000
I agree with Chuck. Now that I know the 241 can probably only handle 5hz, I'll
probably go for the FBM207, it's not that expensive and it has 16 channels
Thanks for sharing your thoughts and suggestions!
Dirk
-----Original Message-----
From: foxboro-bounce@xxxxxxxxxxxxx [mailto:foxboro-bounce@xxxxxxxxxxxxx] On
Behalf Of cleddon@xxxxxxx
Sent: woensdag 18 april 2012 14:51
To: foxboro@xxxxxxxxxxxxx
Subject: Re: [foxboro] FBM241 - input pulse rate
Seems to me that you will end up with a much more reliable solution with less
engineering time if you purchase the the module designed to do the task as
opposed to rolling your own. What happens if you leave and someone else has to
modify the code you wrote? As I get older (50 < x < 100) I am less inclined to
use customs as opposed to off the shelf components. You will burn through the
cost of the FBM in engineering hours while you are testing code.
Chuck Leddon
-----Original Message-----
From: Ken Heywood <KHeywood@xxxxxxxxxxxxxxxxxxxxxxxxxx>
To: foxboro <foxboro@xxxxxxxxxxxxx>
Sent: Tue, Apr 17, 2012 12:59 pm
Subject: Re: [foxboro] FBM241 - input pulse rate
Ah, the horse lives. Yes you can count pulses, but then you must determine
rate.
ou are still at the mercy of the BPC. At such slow rates as 10Hz, it may be
etter to measure the period of the on or off state (assuming 50% duty cycle) nd
then calculate the rate in a CALC block as the inverse of that period.
hank You,
en Heywood
alibration Laboratory Manager
PROCESS CONTROL SERVICES, INC.
stablished in 1983
http://www.processcontrolservices.com
mailto:KHeywood@xxxxxxxxxxxxxxxxxxxxxxxxxx
elephone: 734-453-0620
ireless: 508-241-2040
===============================================
-----Original Message-----
rom: foxboro-bounce@xxxxxxxxxxxxx [mailto:foxboro-bounce@xxxxxxxxxxxxx] On
ehalf Of Douglas G. Lloyd
ent: Tuesday, April 17, 2012 12:23 PM
o: foxboro@xxxxxxxxxxxxx
ubject: Re: [foxboro] FBM241 - input pulse rate Ken/Dirk, Not to beat a dead
horse, but you could use PLB logic in the FBM241 to avoid the P BPC issue.
Pulse capture resolution (using PLB counters) is then up to the rocessing speed
of the PLB logic (5-10msec?) and the actual FBM ardware/software...
Regards,
oug
______________________________________________________________________
his mailing list is neither sponsored nor endorsed by Invensys Process ystems
(formerly The Foxboro Company). Use the info you obtain here at our own risks.
Read http://www.thecassandraproject.org/disclaimer.html
oxboro mailing list: //www.freelists.org/list/foxboro
o subscribe: mailto:foxboro-request@xxxxxxxxxxxxx?subject=join
o unsubscribe: mailto:foxboro-request@xxxxxxxxxxxxx?subject=leave
_______________________________________________________________________
This mailing list is neither sponsored nor endorsed by Invensys Process Systems
(formerly The Foxboro Company). Use the info you obtain here at your own risks.
Read http://www.thecassandraproject.org/disclaimer.html
foxboro mailing list: //www.freelists.org/list/foxboro
to subscribe: mailto:foxboro-request@xxxxxxxxxxxxx?subject=join
to unsubscribe: mailto:foxboro-request@xxxxxxxxxxxxx?subject=leave
_______________________________________________________________________
This mailing list is neither sponsored nor endorsed by Invensys Process
Systems (formerly The Foxboro Company). Use the info you obtain here at
your own risks. Read http://www.thecassandraproject.org/disclaimer.html
foxboro mailing list: //www.freelists.org/list/foxboro
to subscribe: mailto:foxboro-request@xxxxxxxxxxxxx?subject=join
to unsubscribe: mailto:foxboro-request@xxxxxxxxxxxxx?subject=leave
Other related posts:
