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Analog measurement with under and overflow detection?

Created by: lassi at: 9/10/2008 2:28 PM (3 Replies)

9/10/2008 2:28 PM	Rate (0)
lassi Posts: 6 Rating: (0)	Hello, I have an analog measurement (4-20mA) to wich I use the the FC105 for scaling. I would like to implement a check for under flow and overflow (for example under 3.5mA and over 20.5mA). What would be the corresponding integer values for mentioned wirebreak and overflow currents? Does the analog measurement come between 0-27000 from the card? The analog card is configured for 4-20mA. Thanks for any help!
lassi Posts: 6 Rating: (0)
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I think the Table below should give you enough info. It has both 0-20mA and 4-20mA signals

If you need more info see the manual in the link below and refere to chapter "Representation of analog values"
http://support.automation.siemens.com/WW/view/en/8859629

9/10/2008 2:52 PM	Rate (0)
UMENCHO Diamond Member Joined: 3/21/2006 Last visit: 12/2/2024 Posts: 10229 Rating: (1181)	Hi Read this thread regards

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9/11/2008 7:53 AM	Rate (0)
Aret Posts: 2348 Rating: (265)	You can get signal from 1.185 to 22.81 as usual. That means you get correct code for these values. If signal is even outsude that range you'll get 32767 or -32768 - error code. To determine overrange/underrrange/wire braks and so on you can use SFC51/59 and OB82 (with diagnostic interrup set in HW).
Aret Posts: 2348 Rating: (265)
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