You are not registered yet. Please click here to register!


 
 
plc storereviewsdownloads
This board is for PLC Related Q&A ONLY. Please DON'T use it for advertising, etc.
 
Try our online PLC Simulator- FREE.  Click here now to try it.

New Here? Please read this important info!!!


Go Back   PLCS.net - Interactive Q & A > PLCS.net - Interactive Q & A > LIVE PLC Questions And Answers

Reply
 
Thread Tools Display Modes
Old June 30th, 2020, 06:44 AM   #1
Chris90
Member
United Kingdom

Chris90 is offline
 
Join Date: Jun 2020
Location: UK
Posts: 2
1756-DHRIO to 1794-ASB. Adding IE8 Card

Hello all. I have a job to add a 1794-IE8 Card in slot 5 on an existing Flex IO Rack which uses a 1794-ASB communications module, which communicates to a 1756-DHRIO control logix card. The existing rack only has digital cards in it so far which is why there is no BTR/BTW instructions to copy from. I have zero experience with this kind of communications however i have used MSG instructions in the past.

In terms of retrieving the data from the 1794-IE8 card, i've read that you have to use BTR/BTW instructions. With control logix this is all now handled in the MSG instruction. I've seen an example bit of code which only used a BTR MSG instruction but no BTW?

I have attached screenshots of the current setup. If i need a BTW in there on first pass or anything do you have an example piece of code or point me in the right direction as to how to set this up? the job is only adding 1 flow meter to channel 0 of the new card (4-20ma).

Unfortunately this is a suck it and see it type of job where i'm unable to test in the office prior to site attendance so i'd like to have some confidence that i'm at least heading in the right direction before attending site

In terms of dip switch settings, is there anything i may have to change on the ASB module when adding an analogue card?

Many thanks in advance. I've only been programming for 10 years now so i've been brought up on mainly ethernet!
Attached Images
File Type: jpg Screen shot 1.jpg (160.5 KB, 22 views)

Last edited by Chris90; June 30th, 2020 at 06:50 AM.
  Reply With Quote
Old June 30th, 2020, 09:00 AM   #2
JohnCalderwood
Member
Scotland

JohnCalderwood is offline
 
Join Date: Feb 2014
Location: Stirling, Scotland
Posts: 711
Welcome to the forum, Chris...cracker of a question to start...!

I do have a CLX PLC setup like this, but not done by ourselves.

Yes, you will need a BTW message to the IE8 module to setup the configuration.
Send one integer word to the IE8 in the format in the attached document.
e.g. all channels 4-20mA 0000000011111111

You may also have a tag
LMCC3:I.InputGroupsValid, which if you look at the individual bits 0-5, there should be a 1 for a digital card and a 0 for an analog card.

My BTRs for 1794-IE8 have a length of 9 elements, which I recall was the same for PLC5 config too....

Does any of the above make sense? I hope so....
I need to go off and get back to work.
Attached Files
File Type: pdf IE8 Config.pdf (122.2 KB, 3 views)
  Reply With Quote
Old June 30th, 2020, 09:16 AM   #3
Chris90
Member
United Kingdom

Chris90 is offline
 
Join Date: Jun 2020
Location: UK
Posts: 2
Yes that makes sense thank you! i'll change the elements to 9, i can see this now in the manual

As for the data itself, will this be presented in the typical raw format of 0-30840? which i can then map to a scaling block in my CLX.
  Reply With Quote
Old June 30th, 2020, 10:43 AM   #4
JohnCalderwood
Member
Scotland

JohnCalderwood is offline
 
Join Date: Feb 2014
Location: Stirling, Scotland
Posts: 711
Yes, the 1794-IE8 will give you the 0-30840.

Best of luck!
  Reply With Quote
Reply
Jump to Live PLC Question and Answer Forum

Bookmarks


Currently Active Users Viewing This Thread: 1 (0 members and 1 guests)
 
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 On
HTML code is Off

Forum Jump

Similar Topics
Thread Thread Starter Forum Replies Last Post
1791r 8b8p to 1756 DHRIO comm problem Shilo LIVE PLC Questions And Answers 3 September 11th, 2008 07:38 AM
1756 Enet card and RSlinx ScottTheEngineer LIVE PLC Questions And Answers 5 July 17th, 2008 01:57 AM
1784-PCMK/B Card Health msinclair LIVE PLC Questions And Answers 6 August 13th, 2004 10:19 AM
1756 dh-rio card display tom_stalcup LIVE PLC Questions And Answers 14 July 15th, 2004 11:41 PM
1771-IT card equivalent in CLX (1756) ? grison LIVE PLC Questions And Answers 2 April 12th, 2004 12:55 AM


All times are GMT -4. The time now is 01:16 PM.


.