1746-NI16I application example from AB, PROBLEM?

stuman

Member
Join Date
Feb 2008
Location
Benalla
Posts
37
Hii, in the user manual for the 1746-NI16I AI card, publication 1746-um001_-en-p.pdf on page 7-21 it gives an example of using these cards in Class 3 mode. The value of the configuration they give is -16192 which is meant to equate to +/- 10V, data format 1746-NI4, and 60Hz filter.

I am trying to back calculate it and I think they are way off. Convert the number to binary and you get 1 011 111 101 00 0 000, you then compare that to the configuration table and you don't get what they say.

I get from their value of -16192;
1 = enabled
011 = 40 Hz
111 = does not exist!
101 = user defined scaling
00 = +/- 10V
0 = not used
000 = class 3 does not matter

The question in a nutshell is, are they wrong in their example or am I wrong?

Thanks
Stu
 
The 1746-N16I is current input not voltage?
Ther right you are wrong. The way I see it -16192
is 60hz and +/- 20 ma and the rest is as you have it.
See work sheet below
 
Last edited:
Solved

Yes I know the 16I os for current, whilst the 16V is for voltage, but is my decoding of the -16192 to binary wrong? Using their example of 60 Hz +/- 10V, etc, but but using engineering units =000, and exit calibration = 000, I get with the channel enabled -8288.

How have you gotten 60 Hz out of -16192?

Thanks
Stu

Solved. I presumed that the 2^15 bit just meant that the number was negative, Wrong! As soon as I realised that it was actually the value -32768, it all made sense.

Thanks for your help.
Stuman
 
Last edited:

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