Meeg Posted April 19, 2016 Report Posted April 19, 2016 A very simlpe question this time... :-) According to documentation, the UIA-0800N has 13 bit resolution. Also it states in the documentation that " The 4-20mA input option is implemented using 0-20mA input range." For me this would mean that the value read from the card will be in the range 1638-8192 for a 4-20 mA signal. However, it seems to me that the value read on the AI is still 0-8192 for a 4-20 mA signal.... What is then the actual resolution for the for a 4-20 mA signal? 8192 or 6554 (8192-1638)? Regards Anders
Alexander Posted April 20, 2016 Report Posted April 20, 2016 The resolution is still retained at 13 bit when the 4-20mA selection is made. It will still have the default 0-8191 available, though you can manually enter the min and max value should you wish to scale the 4-20 resolution into real world engineering units. This allows you to bypass needing to implement a linearization block within the ladder.
Meeg Posted May 6, 2016 Author Report Posted May 6, 2016 Thanks for your clearifying answer. The possibility of free scaling is not wery well described in the manuals. The way I understand you the resolution is maintained at 8191 even when 4-20mA is selected. Is this correct?
Alexander Posted May 6, 2016 Report Posted May 6, 2016 This is correct. The resolution is maintained, and the option allows for the lower and upper scaling limit to directly correspond to 4 and 20 respectively instead of 0 and 20.
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