5069-IF8 3-Wire Conversion
- Thread starter FMBandit
- Start date
Sensor +wire to power supply positive, -wire to power supply -/0V whatever you want to call it, signal wire to +input channel.
Would be my guess, if it doesn't like that you might require the same common from the powersupply on the -input of the channel.
Just a guess have not used these new cards much myself.
Would be my guess, if it doesn't like that you might require the same common from the powersupply on the -input of the channel.
Just a guess have not used these new cards much myself.
Oh ouch yeah not supported.
See page 58
https://literature.rockwellautomation.com/idc/groups/literature/documents/um/5069-um005_-en-p.pdf
See page 58
https://literature.rockwellautomation.com/idc/groups/literature/documents/um/5069-um005_-en-p.pdf
I saw that this morning after getting setup. I was hooping someone here ran into the same issue and had a recommendation for an isolator that can convert 3 to 2 wire.
Kinda wish RW would've changed to model number to avoid the confusion. 1769-IF8 =/= 5069-IF8
Looking at the product selection tool, the 5069-IF8 and the 5069-IY4 are the only two analog input options available. According to this manual, neither of those support three wire analog devices.
That's weird, according This Link at pg59 you can use single point transmitters. It would seem crazy to me that RW wouldn't have that ability in any card.
I agree, it is almost like the manual listing compatability, conflicts with the wiring diagram they show in the other for the "universal" 5069-IY4.
I don't know what they're doing with the manuals. Page 58 of the one I linked states clearly that single point transmitters are compatible. The manuals are dated few months apart. I guess I'll have to get an IY4 and just try it out.
A month too late, I know, but...
I saw this thread and thought "there's no way in the world a 5069-IF8 doesn't support 3 wire transmitters" and figured I'd find a working example onsite to prove it, then post back. I then promptly forgot about it.
But I remembered this morning, and yes, I have wired 2, 3 and 4 wire 4-20mA transmitters to a 5069-IF8 and it works just fine. I mean, how could it *possibly* support 2-wire sensors but not 3-wire? The PLC card has no way of even knowing if the transmitter has a third wire!
See my very artistic representation below. You have a two wire sensor and a three wire sensor. From the perspective of the IF8, it's getting a 4-20mA signal on the + terminal, and the current return path flows out of the - terminal back to the DC power supply. How could the card possibly know whether or not the transmitter has a third wire connected to ground or not?
The theory works in practice too - I connected a 3-wire pressure transmitter to a 5069-IF8 a few weeks ago and it worked just the same as the 2-wire transmitter next to it.
I saw this thread and thought "there's no way in the world a 5069-IF8 doesn't support 3 wire transmitters" and figured I'd find a working example onsite to prove it, then post back. I then promptly forgot about it.
But I remembered this morning, and yes, I have wired 2, 3 and 4 wire 4-20mA transmitters to a 5069-IF8 and it works just fine. I mean, how could it *possibly* support 2-wire sensors but not 3-wire? The PLC card has no way of even knowing if the transmitter has a third wire!
See my very artistic representation below. You have a two wire sensor and a three wire sensor. From the perspective of the IF8, it's getting a 4-20mA signal on the + terminal, and the current return path flows out of the - terminal back to the DC power supply. How could the card possibly know whether or not the transmitter has a third wire connected to ground or not?
The theory works in practice too - I connected a 3-wire pressure transmitter to a 5069-IF8 a few weeks ago and it worked just the same as the 2-wire transmitter next to it.
Good on you for following up! He posted the same question on Reddit first, saying he was having trouble getting it to work. I noted that I also have working 3-wire transmitters on those cards so asked him a few questions about why he was having trouble. He never answered and instead posted the same question here
Thank you for posting the 3 wire solution. Made my heart flutter as we are looking at standardizing 400 sites with CompactLogix and ControlLogix...
Rockwell support is firm that a 3 wire device is not supported on the 5069-IF8 card. But, as you said, how the hell does the card know the diff between a 2 wire and 3 wire device. Seems very similar to connecting a 3 wire device to a 1756-IF8 card.
Cheers,
Rockwell support is firm that a 3 wire device is not supported on the 5069-IF8 card. But, as you said, how the hell does the card know the diff between a 2 wire and 3 wire device. Seems very similar to connecting a 3 wire device to a 1756-IF8 card.
Cheers,
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