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 AB ENI Modules 
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Trooper
Trooper

Joined: Fri May 29, 2009 6:03 am
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Post AB ENI Modules
I hope this is an appropriate place to post this. I would like to ask you guys of vast experience your take on Allen Bradley Ethernet ENI modules. You know those little high dollar devices they sell to convert DF-1 devices like Micrologix or SLC 5/03 to ethernet. What problems have you experienced? What are your recomendations on applications? What have you learned using them? How have you coped with working around some of there drawbacks like, limited connection? Have you ever had problems with them dropping off your network? If so what did you do to resolve the issue. I know someone has figuired this out and I am too tired and busy to re-invent the wheel here. Sure would appreciate your input. :scratch:


Tue Jun 02, 2009 4:34 pm
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Post Re: AB ENI Modules
This is certainly an appropriate place to ask. I've used ENI modules, but not enough to provide much feedback.

You may get more traction posting on PLCTalk or Mrplc.

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Nathan Boeger, CISSP-ISSAP, CCNP Voice, VCP
Not Another Industrial Blog - My SCADA software blog
"Design Simplicity Cures Engineered Complexity"


Tue Jun 02, 2009 4:46 pm
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Post Re: AB ENI Modules
I used these quite a few years ago with a SLC/504. I remember them being very spotty. They would drop off the network just like you mentioned. I remember we rigged up the PLC to handshake with FactorySQL, and if the handshaking stopped, the PLC would drop a relay that was powering the Net-ENI, which would restart it so the comm would come back up. Yuck!

There is a much better alternative though... I forget what its called, the PLC guys around the office will know, I'll post back tomorrow morning.

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Carl Gould
Co-Director, Software Engineering
Inductive Automation


Tue Jun 02, 2009 8:16 pm
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Joined: Tue Mar 24, 2009 9:14 am
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Location: Hudson, MI
Post Re: AB ENI Modules
You may want to take a look at converters from USConverters. The driver will add a "virtual serial port" to your PC. Seems to be a lot more stable than the ENI's. Just my opinion, although my opinion plus a dollar will buy you a can of soda... :wink:

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Jordan

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Wed Jun 03, 2009 3:30 am
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Post Re: AB ENI Modules
Ok, the device I was talking about was a WebPort 500 by Spectrum Controls - it comes highly recommended from the PLC guys around here.

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Carl Gould
Co-Director, Software Engineering
Inductive Automation


Wed Jun 03, 2009 8:00 am
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Post Re: AB ENI Modules
I have used Digi One IAPs with success in the past.


Wed Jun 03, 2009 12:28 pm
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Captain
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Joined: Fri Apr 27, 2007 5:25 am
Posts: 88
Location: Fremont, CA
Post Re: AB ENI Modules
RedLion data stations also work wonders for serial->ethernetIP translation. They have many more features than that, too.


Wed Jun 03, 2009 8:55 pm
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Post Re: AB ENI Modules
Heh, it sounds like the consensus is: use anything but AB Net-ENI modules!

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Carl Gould
Co-Director, Software Engineering
Inductive Automation


Thu Jun 04, 2009 8:01 am
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Joined: Wed Jun 30, 2010 9:58 am
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Post Re: AB ENI Modules
I have used NET-ENIs quite a bit with SLCs and Micrologicx. I have not had problems with communication between PLCs or even PACs (Logix platform), but often have problems with RSLinx correctly identifying the PLCs, especially in a spotty radio network. Sometimes this can be fixed with the latest version of RSLinx.

I have also found that setting the PLC communication channel to the highest baud rate speeds up the identification process. Turning the ENI off and on after making changes to the ENI also helps (this is true for any AB comm adapter). Allen Bradley will tell you that there may be problems with old revisions of PLCs, but I don't know if this is true or just an excuse.

If you have the means, the Micrologix 1100 and 1400 are currently my favorite PLCs. They are very low cost ($500-$1400), very capable, expandable, and have a serial and ethernet connection. One of the AB tech support people I spoke with even recommended using the 1100 instead of the ENI.

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Erik Burns, PE


Wed Aug 18, 2010 9:10 am
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