Previous in Forum: Instrument Calibration Report Form   Next in Forum: Smart Plant Instrumentation
Close

Comments Format:






Change Mode
Close

Subscribe to Discussion:

CR4 allows you to "subscribe" to a discussion
so that you can be notified of new comments to
the discussion via email.

Close

Rating Vote:







Add Vote
2 comments
Rate Comments: Nested
AMO
Member

Join Date: Sep 2010
Location: Africa
Posts: 8

Apacs Moore PLC

02/01/2011 2:03 AM

I have a SAM (standard analog module) and I need to know if this is possible.

We have an FIT in the field that has its own independant 24v power supply. Can we terminate the 4-20mA signal coming from the FIT onto this SAM card straight or do we need to put in a 250 ohm resistor?

Or will this even work, do we need to use a VIM card
Register to Reply
Interested in this topic? By joining CR4 you can "subscribe" to
this discussion and receive notification when new comments are added.
Carl_E
Power-User

Join Date: Nov 2009
Posts: 335
Good Answers: 63
#1

Re: Apacs Moore PLC

02/01/2011 11:36 AM

If you use a 250 ohm resistor for other 4-20mA analog signals to that analog input card, then you need a resistor for this channel, too.

You might find when connecting this analog signal that it is either offscale up or offscale down or that connecting it affects other signals on that analog input card. This can happen when an analog signal is powered from another electrical source at a different ground potential. Connecting such a signal to an analog input card forms a ground loop. If that happens then you need a 4-20mA signal isolator module which 'breaks' the ground loop.
Register to Reply
Ducdude
Commentator

Join Date: Oct 2009
Posts: 60
#2
In reply to #1

Re: Apacs Moore PLC

02/02/2011 8:36 AM

Carl,

I do not have a direct answer for you but have you given Moore/Siemens a call for support? 1-800-333-7421 I have always found they are very good at supporting their equipment...

Cheers,

Ducdude
Register to Reply
Register to Reply
Have a Different Question?
2 comments

Previous in Forum: Instrument Calibration Report Form   Next in Forum: Smart Plant Instrumentation

Advertisement

Got Something to Say?
Ask a Question
Start a Discussion

Search this Forum
Instrumentation:
Go

CR4 Sections
Aerospace
BioMech & BioMed
Chemical & Material Science
Civil Engineering
Communications & Electronics
Education and Engineering Careers
Electrical Engineering
General Discussion
Instrumentation
Manufacturing
Mechanical Engineering
New Technologies & Research
Software & Programming
Sustainable Engineering
Transportation

Site Directories
Forum Directory
Blog Directory
User Group Directory
RSS Feeds

CR4 Rules of Conduct
CR4 FAQ
Site Glossary

Who's Online (58 right now)
Show Members
Advertisement