FieldComm Group Forums for FOUNDATION Fieldbus technology  

Go Back   FieldComm Group Forums for FOUNDATION Fieldbus technology > Public Forums > Fieldbus User's Network [FUN]

Fieldbus User's Network [FUN] The Fieldbus User Network List Forum. Post your fieldbus related questions here.

Thread Tools Display Modes
Prev Previous Post   Next Post Next
Old August 26th, 2008, 09:08 AM
pascal pascal is offline
Registered User
Join Date: Aug 2008
Posts: 1
Talking Maximum unbalanced capacitance of FDU devices

IEC6158-2 y FF-816

There is a note in the FF standard that says:

"The maximum unbalanced capacitance to ground from either input terminal of a device shall not exceed 250pF"

Is it supposed to be measured with the segment powered on or off ?

The question comes because the capacitance measurment of the FF segment is done with the segment powered off (offline), but what did it happen when I want to measure it in every FDU ?

(FDU: Fieldbus distribution unit)

We have measured it in both cases and the values change how expected.
1 24VDC connected to the Trunk > Spur Capacitance measurement A
1 24VDC disconnected from the Trunk > Spur Capacitance measurement B

The best answer wins a nice tour in Santiago Chile & Los Andes (Tickets not included)




Thread Tools
Display Modes

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is Off
HTML code is Off

Forum Jump

Similar Threads
Thread Thread Starter Forum Replies Last Post
Project Work EngineerUmair Fieldbus User's Network [FUN] 18 March 27th, 2007 11:29 AM
Maximum spur length for FISCO devices? prachides Fieldbus User's Network [FUN] 3 October 9th, 2006 04:45 AM
[FUN] FF Data Sheets - ARCHIVE Stephen Mitschke Fieldbus User's Network [FUN] 1 May 17th, 2006 08:53 AM
Backup LAS - response for VickyWu Robin Burnikell Fieldbus User's Network [FUN] 11 June 22nd, 2005 03:16 PM

All times are GMT -5. The time now is 02:07 PM.

Powered by vBulletin® Version 3.8.9
Copyright ©2000 - 2018, vBulletin Solutions, Inc.
(c) 2011-2015 by FieldComm Group. All rights reserved.