Pulse Input

Guest

The Puffin Projects

PLC Archive

Links
Topics
About Us
Poetry
Home

Applications - Automation Business - Communications - Engineering Practices - HMI - Information Resources - LinuxPLC Project - Motion Control - Open Control - PCs in Automation - Plant Networking - PLCs - Programming Languages - Process Control - Sensors - Software

Return to Home

Pulse Input
May 16, 2008 9:38 pm, by pchan
Subject : Applications
from the DCS dept.
Text :
I am connecting a coriolis meter to DCS. The coriolis meter gives a pulse output, and I am connecting the pulse output to a DCS pulse card.

Please advise if I need to do a conversion from pulse signal to 4-20ma inside the DCS logic.
Reply

RE: Pulse Input
May 18, 2008 5:22 pm, by wboyes
Probably not.

If the coriolis meter is putting out a _scaled_ pulse, then all you have to do is totalize. If you want to see flow rate, take the 4-20 signal from the coriolis meter separately into the DCS. If the coriolis meter is producing an unscaled frequency output, you need to condition it before using it.

Walt Boyes
Editor in Chief
Control and Controlglobal.com
www.controlglobal.com
Mailto:wboyes@putman.net
Read my blog SoundOFF!! At www.controlglobal.com/soundoff
Reply

Re: Pulse Input
May 17, 2008 12:38 pm, by Roy Matson
Is the pulse something like 0-10,000 Hz in which case you would need a special high speed input module or more like
1 pulse for each unit that passes e.g. 1 pulse/liter in which case you would use a discrete input module with a counter in the DCS
If you give Make/Model of your transmitter someone will know it for sure!

Roy
Reply

Re: Pulse Input
May 18, 2008 5:20 pm, by pchan88ca
Thanks for your response. The make of the meter is Endress & Hauser and model Promass. I am thinking of connecting to a pulse card. But, do you need to configure by software for converting pulse input to digital in the logic diagram (FLD)?
Reply

The man who sets out to carry a cat by its tail learns something that will always be useful and which never will grow dim or doubtful. - Mark Twain

Your use of this site is subject to the terms and conditions set forth under Legal Notices and the Privacy Policy. Please read those terms and conditions carefully. Subject to the rights expressly reserved to others under Legal Notices, the content of this site and the compilation thereof is Š1999-2006 Control Technology Corporation. Powered by Python, Zope, and Squishdot, inspiration by Slashdot. (Vers.ZSQ1.0) -va-