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I have never ever done that and have never had problems. By Joe on 5 March, – Is 1746-no4u problem apparent on all analog inputs or just a few? Select the categories for which you would like to see messages displayed Your use of this mabual is subject to the terms and conditions set forth under Legal Notices and the Privacy Policy.

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Techncial Consultants matthewhyatt msn. It’s like having the store come to you! What is the measure PS output current? Attached only at the PLC end? Double check all the loops, their rspective shielding and such.


Cable lengths from SLC analog module to the instrument may contribute to your noise problem. 1746-no4 we connect it in simulate using the loop PS we get the same 5-bit noise.

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 ? If this does not work then see below. You may install a 176-no4i good brand DC power supply, Omron or Cosel brands are the one we’re mostly using.

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A-B Analog Input Problem

The problem transmitter is a rosemount C 2-wire transmitter. Click a thumbnail to view larger image: Try putting an approriate resistor in the line, and put an oscilliscope across it to see what sort of ripple you get out of the transmitter. Please note that any additional items included with this equipment such as accessories, manuals, cables, calibration data, software, etc.


If your power supply is supplying another devices try to use an external power supply only supplying your transmitters.

Do a very methodical, check of the system. By Bob Peterson on 9 March, – 1476-no4i By Anonymous on 10 March, – 6: 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. Also, don’t rule out the input card.

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To exclude a word, precede it with a “-“, as follows: Ground loops can be a problem if attached manal both ends. AB SLC analog inputs typically have at least 1, sometimes 2 bits of noise anyway. I am assuming that you are using mA loops. What else is using that power supply?