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It is possible there is an isolation problem with 2-wire and 4-wire transmitters on the same card but we have moved the 4-wire devices to another card. What else is using that power supply?

Rockwell Automation 1746-XXXX SLC 500 4-Channel Analog I/O Modules User Manual User Manual

You might be getting noise due to this power phase difference. Please contact one of our Customer Support Specialists if you have any questions about what is included with this equipment or if you require any additional information. We have checked and added grounds with no improvement. 1746-ni4i, don’t rule out the input card. Valid Email Required Item to Inspect: By Matthew Hyatt on 9 March, – 7: If we connect it in simulate using the loop PS we get the same 5-bit noise.


I don’t know for sure, but I’ve got a hunch that the P4 power supply is a big part of your noise problem Your subscription request is being kanual.

Manuals, Datasheets, Drivers, Links. Are you using it in mA mode?

Since the input works OK with an external self powered source and does not 1746-mo4i a loop powered external source, you may have some noise or such related to the power source.

To exclude a word, precede it with a “-“, as follows: You state that if you use a simulator on an isolated power supply, that you get a much better signal, right?

Another interesting observation is with the real signal connected, the problem appears worse if the shield is removed. Techncial Consultants matthewhyatt msn. First I would use different power supply than the AB for loop power.

Kanual feel free to contact us at sales artisantg.

1746-no4o AB SLC analog inputs typically have at least 1, sometimes 2 bits of noise anyway. The problem transmitter is a rosemount C 2-wire transmitter. When you say that you are 5 bits off the expected value, do you mean that, for example, when you are expecting an unscaled value of binary you get a value of binary ?

As i recall the 24V user supply coming from the AB slc power supply is not regulated. This is difficult one especially not being there.


A-B Analog Input Problem

If the loop wires run a long distance through conduit, it may be possible that a cable was damaged. Select the categories for which you would like to see messages displayed Please note that any mahual items included with this equipment such as accessories, manuals, cables, calibration data, software, etc. I have never ever done that and have never had problems. Buying used equipment doesn’t always have to be a shot in the dark.

Product price, specification, warranty and availability subject to change without notice. Do a very methodical, check of the system. Double check all the loops, their rspective shielding and such. You may find 1746-noo4i solution to be using a seperate power supply to power 174-no4i analog loops.

Other then that I’m at a loss. What is the measure PS output current? Thank you for submitting your InstraView Request!

Cable lengths from SLC analog module to the instrument may contribute to your noise problem. The NI16 is a multi-class Class 1 or Class 3 single-slot module.

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