12/18/2018 8:26 PM | |
Joined: 3/28/2010 Last visit: 9/21/2024 Posts: 1056 Rating: (213) |
Your sketch looks OK. [snip] I'm guessing that the internal resistance (current inputs are 25 ohm resistance)
[snip] must be 'switched' into the input circuit when Mode D is selected because there does not seem to be any mechanical means of switching in the resistance. [snip] >However, when AI is looped ( as shown in attached fig.) there is no display in the field instruments, and the AI channel shows a reading of -32768. Does that mean that when the AI is wired into the loop, that the level transmitter goes dark (fails to operate) and the RD100 goes dark (fails to display values)? Hopefully, the board is still functional given the warning about applying voltage when the input is configured for current. Attachmentimages.zip (286 Downloads) |
Last edited by: Jen_Moderator at: 12/19/2018 9:02:05 AMRemoved links and added files as an attachment. |
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12/24/2018 6:22 AM | |
Joined: 3/28/2010 Last visit: 9/21/2024 Posts: 1056 Rating: (213) |
I have some experience with Siemens field instruments, but no experience with Siemens PLC's or their analog cards. But I poked around and found Siemens' tutorial on 4-20mA inputs.
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Last edited by: Jen_Moderator at: 12/25/2018 2:12:07 PMOptimized link. |
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