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Rockwell Automation
If the loop wires run a 7146-no4i distance through conduit, it may be possible that a cable was damaged. 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 We can’t use any damping or filtering because some of these signals are used for leak detection and damping masks, or at least dampens, leak detection sensing.
You state that if you use a simulator on an isolated power supply, that you get a much better signal, right? You can mnual in close to see the labels with the serial number or zoom out to see the overall condition of the equipment. How many transmitters are run off the power supply? Your use of this site is subject to the terms 17466-no4i conditions set forth under Legal Notices and the Privacy Policy.
Shields should be tied to earth ground at one end only, not the PS return, also typically the PS return should 174-6no4i tied to ground as well, unless there is some reason you need it floating.
Buying used equipment doesn’t always have to be a shot in the dark. Use double quotes around phrases, as follows: The 5-bit noise is a maanual.
Please contact us to complete your request. By Anonymous on 10 March, – 6: Also, any power filters and or isolation transformers on your PLC power supply?
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To exclude a word, precede it with a “-“, as follows: Valid Email Required Item to Inspect: Cable lengths from SLC analog module to the instrument may contribute to your noise problem. What are the wire lengths involved? You may have some issues with noise if the conduit carrying the wire isn’t isolated from say discreet 17446-no4i signals or motor leads.
Username Password Remember me on this computer. By Mark on 11 March, – 5: We are seeing 146-no4i bits of noise that we can’t explain.
Please feel free to contact us at sales artisantg. Start this test at the transmitter, and work your way along the signal lines until you determine where the noise is introduced.
What is the maximum current output of the PS? Note that common words and, that, etc. Check wiring connections and terminations. You had not mentioned if you are using ma or V analog signal from those instruments.
We appreciate your interest in using our InstraView website! By Ron on 9 March, – Manuals, Datasheets, Drivers, Links. AB SLC analog inputs typically have at least 1, sometimes 2 bits of noise anyway. 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.
Double check all the loops, their rspective shielding and such. I’ve recommended redoing all the grounds and checking shielding. If your power supply is supplying another devices try to use an external power supply only supplying your transmitters.
I’m going to go out on a limb and suggest that the problem is probably not noise, at least not localized to the current loops. Just a few things to check, David. Product price, specification, warranty and availability subject to change without notice.
Rockwell Automation 1746-XXXX SLC 500 4-Channel Analog I/O Modules User Manual User Manual
Please read those terms and conditions carefully. By Vic Penaranda on 18 March, – 9: 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 ? All logos and trademarks are properties of their respective companies. I 1746-jo4i assuming that you are using mA loops.