I spent way too long trying to figure out the meaning of 27648. There are many other mentions of it as a PLC range. I couldn't arrive at any obvious reasons to use the value. I've seen mention of (-27648, 27648), so maybe the other 10,240 values (starting from 2^16, a 2 byte word, which does make sense) are reserved for something? I have no idea. Maybe we'll get an old timer to step in and shed some light on the issue...
rsdoran said:What I never understood was 27648, where does that number come from?
16384 is easy, 2 to the power of 14, standard resolution for many analog devices.
Regardles of how you look at if 16384 is the input values then its divided by 20 then times 4 to get the value = to 4ma.
Another way to do that since many KNOW off the top of their head 20/5 = 4 is divide 16384 by 5, same result.
WAIT, I think the 27648 was a misprint (error), 2^15 is 32768, close enough for me.