Rounding to nearest 10th Control Logix

I am needing some assistance on rounding to 10th in control logix.


I am reading a real number for density out of the meter of i.e 45.23324. I would like to round this to 45.2 and move this number to an AO for an LED Display. The TRN function takes me to the nearest whole number and the same with a DINT which rounds to a whole number. Thanks in advance!

MUL REAL 10 Temp_DINT This will give you 452

DIV Temp_DINT 10 REAL_2 This changes the decimal place back to where it was.

EDIT: For more decimal places multiply & divide by larger numbers. X/|100=0.01 X/|1000=0.001

Multiply by 10 then round and then divide by 10

Just be aware that rounding in control logix handles rounding a little differently when it comes to values with a .5 on the end. It rounds them to the nearest even integer.

1.4999 rounds to 1
1.5 rounds to 2
2.5 rounds to 2
2.5001 rounds to 3
3.4999 rounds to 3
3.5 rounds to 4
4.5 rounds to 4

And so on. I say this, because it may catch you out if you use the methods above, e.g. if your number is 3.45. You may be expecting the answer to be 3.5, but...

3.45 * 10 = 34.5
34.5 rounds to nearest even integer, i.e. 34
34 / 10 = 3.4

Thanks for the suggestions. I will give this a shot.

If you are moving it to an analog output, why round it?
Can't you just set your meter to show only one decimal place?