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If we put a loop simulator transcat mini-source 5 step 1746-o4i replacement of the transmitter and use it in source i. I have never ever done that and have never had problems. Also, don’t rule out the input card.

Rockwell / Allen-Bradley NI4 – In Stock, We Buy Sell Repair, Price Quote

Other then that I’m at a loss. By Mark on 11 March, – 5: Remember me on this computer. If this does not work then see below. I’ve recommended redoing all the grounds and checking shielding.

Attached only at the PLC end? Start this test at the transmitter, and work your way along the signal lines until mmanual determine where the noise is introduced.

A-B Analog Input Problem

Double check all the loops, their rspective shielding and such. This is with the simulator at the control panel. Some tips for better search results This will show you where you need to focus your efforts.


Are you using it in mA mode? There could mabual a more systemic problem, for example, some unshielded device like a CRT very close to the rack. The 5-bit noise is a problem. Another thing I would use mA optical isolater on 4-wire transmitter and see if it is source of problem.

It also provides 4 analog output channels.

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

You may install a quite good brand DC power supply, Omron or Cosel brands are the one we’re mostly using. I am assuming that you are using mA loops.

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. Stock Quick Quote. We have checked and added grounds with no improvement. This is difficult one especially not being there.

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Username Password Remember me on this computer. Get a scope or a scope meter, you may even be able to locate the noise with a AC voltmeter set on low range. Do not connect any other load to this power manial specially inductive ones, like relays.

A separate power supply may help solve this, meaning all instruments will take power from this power supply. Are there any junction boxes between the PLC input card and the transmitters?


I would look at anything else that may be on that 24VDC buss that could be dumping noise into the power supply. 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 For the analog signal cabling, connect the shield ground only on one point, maybe near the analog input module. I’m having a difficult time with some analogs actually all on an SLC and I’d like you comments and suggestions.

Please note that any additional items included with this equipment such as accessories, manuals, cables, calibration data, software, etc. Select the categories for which you would like to see messages displayed If not you might want to disconnect each individual analog and reland one at a time and see if there is one that is causing problem and try with and without an optical isolater on each point.

Well, what if you were able to see a piece of equipment before you purchased it? Your use of this site is subject to the terms and conditions set forth under Legal Notices and the Privacy Policy. By Joe on 5 March, – By Anonymous on 10 March, – 6: