User Manual Instruction Manual

Publication 1746-UM009B-EN-P - September 2007

Processor and Module Considerations 35

EXAMPLE

If the module’s output range is 4…20 mA and you want to set

the output to 4 mA, compute the output image value as follows.

IMPORTANT

The actual resolution for analog current outputs is 2.56348

µA/LSB, where the 14-bit decimal representation is left

justified as follows.

EXAMPLE

Use the following formula to compute the output image value if

the module’s output range is 1…5V dc and you want to set the

output to 1V dc.

IMPORTANT

The actual resolution for analog voltage outputs is 1.22070

mV/LSB, where the 14-bit decimal representation is left

justified as follows.

31,208

20 mA

Output Image Value =

x 4 mA 6242

–

CHANNEL OUTPUT WORD

15 14 13 12 11 10 9 8 7 6 5 4 3 2 1 0

Bits not

Isbmsb

16,384

5V dc

Output Image Value =

x 1V dc 3277

–

Channel Output Word

15 14 13 12 11 10 9 8 7 6 5 4 3 2 1 0

Bits not use

Isbmsb