4/11/2019 3:09 AM | |
Joined: 3/28/2010 Last visit: 8/21/2024 Posts: 1052 Rating:
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I share your pain. I've wired field instruments to maybe 200 different analog inputs over the years and it fascinates me how obscure and difficult Siemens documentation is when it comes to a simple explanation of what a module's function is and how to make field wiring connections. (only SICK is more obtuse than Siemens). I would post links to individual screen shots for my manual references below, but I've had the forum moderators pull my links and zip them into a single zip file. No one wants to bother to unzip a bunch screen shots to figure out which one is referred to, so I'll only reference the page numbers and save you the effort of a zipped file and me the effort of posting screen shots. I actually doubt that the module can handle externally powered 4-20mA signals because of the statement on page 11: |
Last edited by: Jen_Moderator at: 4/11/2019 10:07:26 AMOptimized link. |
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4/11/2019 9:28 AM | |
Joined: 4/4/2019 Last visit: 7/11/2024 Posts: 59 Rating:
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All that I can say is: "Thank you man". I'm witha colleague and we are close to make an "invention" to make it work. We have a lot of 4-20mA devices connected to an AI but this is the first time that is a connection of Active VS Active. I can't believe that Siemens doesn't have a solution to convert or have a Passive input, because I can't change the output of the valve to a passive one. So at the moment we are working in a small circuit to put it in the valve a have a passive signal. Thank you again. |
4/11/2019 2:54 PM | |
Joined: 3/28/2010 Last visit: 8/21/2024 Posts: 1052 Rating:
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I think your analysis is correct - mismatch between active valve output, active AI input - and no apparent means of making the AI passive. I've never had to use one (because active AI inputs are rare outside of the DCS world) but there are 4-20mA signal isolators that are passive on both sides: passive input, passive output. |
Last edited by: Jen_Moderator at: 4/12/2019 7:56:25 AMRemoved link and added file as an attachment. |
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