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Old September 23rd, 2023, 06:59 PM   #1
tlf30
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Cheap USB to DeviceNet/ControlNet

Does anyone know of a cheap USB to ControlNet or USB to DeviceNet adapter (I'm looking for both).
I thought PLC Cable would have one but I did not see anything.

Thanks,
Trevor
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Old September 24th, 2023, 03:17 AM   #2
Phil Buchanan
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You mean you don’t want to pay $2500.00 each for the Allen Bradley ones?
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Old September 24th, 2023, 03:05 PM   #3
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LOL, no. I want something for at home on me bench. If it was for work I would just have the company buy it, but I want something that is for home within my home budget.
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Old September 25th, 2023, 07:38 AM   #4
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Quote:
Originally Posted by tlf30 View Post
I thought PLC Cable would have one but I did not see anything
Thanks for checking Trevor, there's not a big enough market for them to build an aftermarket version

I would try ebay but even there the prices are staying really high but you may find a deal
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Old September 25th, 2023, 09:07 AM   #5
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I am not an expert in ControlNet or DeviceNet, so maybe a dumb question.
Assuming this is for ControlLogix. Doesn't the current CPUs all have an ethernet port ? Why not use the CPU as a gateway to the ControlNet or DeviceNet networks ?
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Old September 25th, 2023, 09:23 AM   #6
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Just depends on the setup, if they are using a 1756-CNB or 1756-DNB and have either Devicenet or Controlnet at the network then they may have an older CPU that they would also need a ENBT or EN2T, they may also want to access others on the two Networks that dont have Ethernet, I would think that all new systems are going Ethernet

There are a lot of older systems out there running that need servicing
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Old September 25th, 2023, 10:05 AM   #7
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For these very old systems without Ethernet. Can you browse through the serial port to Devicenet or controlnet ?
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Old September 25th, 2023, 10:08 AM   #8
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Quote:
Originally Posted by JesperMP View Post
For these very old systems without Ethernet. Can you browse through the serial port to Devicenet or controlnet ?
I dont know but guessing.... I would say no, AB would much rather sell you a very over priced USB cable
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Old September 25th, 2023, 12:42 PM   #9
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AB used to sell a serial to DeviceNet adapter, 1770-KFD. But they are still not cheap.
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Old September 25th, 2023, 02:40 PM   #10
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Quote:
Originally Posted by alan_505 View Post
AB used to sell a serial to DeviceNet adapter, 1770-KFD. But they are still not cheap.
A lot cheaper than a 1784-U2DN, even once you throw in a usb adapter.

To quote Ken Roach back in 2014:
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The answer to your actual question: "what's the cheapest way to get my PC connected to DeviceNet" is "a used 1770-KFD and a USB/RS232 converter".
As far as I know this has not changed.
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Old September 25th, 2023, 11:15 PM   #11
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Thanks, I'll take look at the 1770-KFD.
I'm just working on my test bench at home, and while I can plug directly into the serial port on my L62, I want to be able to use it to connect to other things and still go online with the controller. I have both DeviceNet and ControlNet networks on the main rack though. My Ethernet card is currently being used in another project, so I don't have a way to go online.
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Old September 26th, 2023, 11:04 AM   #12
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Quote:
Originally Posted by tlf30 View Post
Thanks, I'll take look at the 1770-KFD.
I'm just working on my test bench at home, and while I can plug directly into the serial port on my L62, I want to be able to use it to connect to other things and still go online with the controller. I have both DeviceNet and ControlNet networks on the main rack though. My Ethernet card is currently being used in another project, so I don't have a way to go online.

if you have space in your rack they pretty much give away used 1756-enbt on ebay.
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Old September 26th, 2023, 01:21 PM   #13
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If itís just for home you may be better served to get on eBay and find the old PCMCIA card versions and an old laptop off eBay with a real PCMCIA port or you can get a PCMCIA port replicator but they donít all work well with those old AB cards so you have to be careful with that which is why the older laptop with a real PCMCIA port may be a better solution.
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Old September 26th, 2023, 02:54 PM   #14
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You can browse through the serial port on the CPU and access the devices on ControlNet and DeviceNet. It is slow, but it works. For ControlNet it isn't a big issue, but for DeviceNet the speed through the serial port is definitely a noticeable drawback.

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Old September 27th, 2023, 04:55 AM   #15
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You can browse through the serial port on the CPU and access the devices on ControlNet and DeviceNet. It is slow, but it works. For ControlNet it isn't a big issue, but for DeviceNet the speed through the serial port is definitely a noticeable drawback.
Probably the same speed as you would get with the 1770-KFD. And then you can go online to both Controlnet and Devicenet with no further complexity or investment.

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if you have space in your rack they pretty much give away used 1756-enbt on ebay.
I know what I would do
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