Rockwell Automation 1746-FIO4V SLC 500 Fast Analog I/O/ User Manual User Manual
Page 35
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
Isb
msb
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 used
Isb
msb