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.

---------->>>>>Get FREE PLC Programming Tips

New Here? Please read this important info!!!


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

PLC training tools sale

Reply
 
Thread Tools Display Modes
Old December 1st, 2017, 11:16 PM   #1
ds7891
Member
United States

ds7891 is offline
 
Join Date: Sep 2016
Location: Las Vegas
Posts: 42
24v POE Injector - DIN Rail - Ubiquti

For those of you who use Ubiquiti. You will all know that they use a 24v POE voltage on 50% of their gear instead of the 48v 802.3af standard. Of course, there are pros and cons with this.

Pro being that you can use a passive poe injector for a single piece of Ubiquiti hardware wired directly to your 24v control power.

Con, because passive poe is "old school", finding a DIN mounted inserter that has a decent form factor is almost non existent. According to my Google-fu. That, and any you do find look like they are due back to the 90's.

Anyway...what do you guys use to power your Ubiquiti gear from the 24vdc control voltage that is so common in most control panels these days?
  Reply With Quote
Old December 2nd, 2017, 01:28 AM   #2
Brandon_K
Member
United States

Brandon_K is offline
 
Join Date: Mar 2016
Location: Pittsburgh, PA
Posts: 138
What are you trying to power downline that is POE? All of the UniFi gear is 802.3af/at at this point. Of course if you're using a Rocket or something for PtP/PtMP that doesn't do you any good. You can always use a 802.3af/at compliant switch in the cabinet and then a INS-8023AF-O at the 24v passive device.

That said, I won't lie. Before they came out with the inline adapters, I have VHB-taped injectors or ToughSwitches to the inside of a cabinet. I always have a Automation Direct FA-REC3 to power plug in devices like that.
  Reply With Quote
Old December 2nd, 2017, 12:09 PM   #3
ds7891
Member
United States

ds7891 is offline
 
Join Date: Sep 2016
Location: Las Vegas
Posts: 42
Quote:
Originally Posted by Brandon_K View Post
You can always use a 802.3af/at compliant switch in the cabinet.
A lot of the Ubiquiti stuff we use (Lower grade Rockets, NanoBeam) aren't 802.3af/at compliant. It seems their higher bandwidth/longer range components use the 802.3 voltage.

Most of the Control cabinet we build for the application which we need the 24vdc Ubiquiti gear, utilize a 24vdc UPS, and everything in the cabinet is 24vdc. Other than the main breaker.

If we went to an 802.3af compliant switch, we would need a 48v power supply correct? I never used an industrial 802.3 switch in a control cabinet.
  Reply With Quote
Old December 2nd, 2017, 12:54 PM   #4
ds7891
Member
United States

ds7891 is offline
 
Join Date: Sep 2016
Location: Las Vegas
Posts: 42
We have gotten away with powering a few Nanobeams with this:

https://www.amazon.com/gp/product/B0...EH2276JE&psc=1

and

https://www.amazon.com/gp/product/B0...R5ECPZZI&psc=1

It works, no problem.

Looks better than a Toughswitch velcro'd to the side wall of a panel, which we have done as well #Brandon_K, .
  Reply With Quote
Old December 2nd, 2017, 04:54 PM   #5
BryanG
Member
United Kingdom

BryanG is offline
 
Join Date: Feb 2005
Location: Manchester
Posts: 1,152
Have just been researching POE injectors and some of those have DC/DC step up converters on board and so can work from a 24V supply. They don't always make it clear in the documentation so it does take some searching. I can't advise on switches but did find single channel injectors.
  Reply With Quote
Old December 2nd, 2017, 06:17 PM   #6
ds7891
Member
United States

ds7891 is offline
 
Join Date: Sep 2016
Location: Las Vegas
Posts: 42
Quote:
Originally Posted by BryanG View Post
I can't advise on switches but did find single channel injectors.
Which ones did you find, because I looked around and called around to only find 802.3's. Nrton, trendnet, and Moxa's single channel only puts out 48v. And then to hang one of the Ubiquiti adapters off of it is not feasible.

Would love to find a DIN mountable single channel injector that is 24v.
  Reply With Quote
Old December 2nd, 2017, 10:21 PM   #7
jsmith1817
Member
United States

jsmith1817 is offline
 
Join Date: Aug 2012
Location: NC
Posts: 6
I've used these injectors a few times. No issues so far. It's not din rail mount but it beats zip tying it to the back panel.

https://www.data-alliance.net/single...-reset-button/
  Reply With Quote
Old December 3rd, 2017, 07:54 AM   #8
BryanG
Member
United Kingdom

BryanG is offline
 
Join Date: Feb 2005
Location: Manchester
Posts: 1,152
Reading back I am still not sure if this is the kind of thing you are looking for, it gives:
IEEE 802.3af PoE,
IEEE 802.3at PoE+
IEEE 802.3 10Base-T,
IEEE 802.3u 100Base-TX,
IEEE 802.3ab 1000Base-T
from a 24V d.c. supply. Haven't used one, I was just looking for 'proof of concept' for a customer who might want to put a camera on to a machine.

https://www.startech.com/Networking-...ctor~POEINJ1GI
  Reply With Quote
Old December 3rd, 2017, 05:41 PM   #9
ds7891
Member
United States

ds7891 is offline
 
Join Date: Sep 2016
Location: Las Vegas
Posts: 42
Just found POEtexas.com

Not sure if they have DIN rail adapters.

Will call them tomorrow.
  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
encoder signal 5V to 24V bennyk@37.com LIVE PLC Questions And Answers 4 February 1st, 2014 08:16 PM
TwinCat examples for how to use TcMC2.lib functions to control motor/linear rail? beoborg LIVE PLC Questions And Answers 0 October 5th, 2012 07:25 AM


All times are GMT -5. The time now is 04:41 AM.


.