Recent Control & Safety Systems Discussions
Similar Posts
Historian is not logging for few DCS tags
Operator Control Moves—Too Many or Too Few?
msgbox question
OPC question
KEPServerEX question
Share

a few newbee questions

Hi

I'm on sick leave, browsing for some delta V knowledge and some questions I can't find a clear answer to. (It's hard to find  free educational resources about Delta V)

What is the difference between FV (field value) en PV (process variable or process value?) end between CV (controlled value or current value) en F_CV ? any other CV’s?

Please explain PV_D.A_CV .

What is the difference between a solid and a dashed line in controle studio?

What is the arbitraire function block DC_ARB ? (it's being used at my work)

What is tracking ?

How would you define a device tag and a device signal tag ?

Where/why should one choose discrete data above boolean data for 2-state evaluation. BF used as OR vs OR-gate ?

Please explain the concept of Local override.

What is the limit value of an alarm mentioned in the alarm panel of Control studio ?

What are alarm thresholds ?

BFI has IN_D inputs. Is this now boolean or discrete?

I'd better stop here ;) Any help is welcome.

Thank you very much in advance

hast66

2 Replies

  • TPatterson
    HERE'S A FEW ANSWERS

    FV is the actual signal coming from the field. PV stands for process variable and it might be the same as the FV, but depending on what is done to the field value (scaling, smoothing etc.) it might be different.

    Solid line means lower number to higher number function block communication. Dashed line means higher number to lower number.

    .A_CV will give you an alphanumeric output instead of .F_CV which will give a number (for instance, a Boolean that is true would show up as TRUE/OPEN/RUNNING etc. vs. showing as 1. You use the named set functionality to define what word is associated with what number.
  • hast66

    In reply to TPatterson:

    Thank you T.
    I've read that the F stood for floating. Are A.CV and F.CV only used in the operate configure app?

    I was hoping for some more answers in the weekend....

This is the official online community site of the Emerson Global Users Exchange, a forum for the free exchange of non-proprietary information among the global user community of all Emerson Automation Solution's products and services. Our goal is to improve the efficiency and use of automation systems and solutions employed at members’ facilities by sharing our knowledge, experiences, and application information.

User Groups | World Areas | Community Guidelines | Legal Information | Privacy Policy | Contact Community Manager

Website translation provided by Website Translator

© 2015-2022 Emerson Global Users Exchange. All rights reserved.