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Scaling
The following graph illustrates the relationship between the output data that is
provided to the module from the backplane, and the actual output current. The
range spans between 4mA and 20mA.
Count vs Output Current
mA
24
20
16
12
8
4
0
0
3200 6400
The following equation can be used to calculate specific output currents:
The count value must be a multiple of 8. If the module receives a count value
that is not a multiple of 8, it rounds the value down to the closest multiple of 8.
For example:
GFK-1504N
Chapter 11 Analog Output Modules
Analog Output Module, 12 Bit Current, 4 Channels
9600 12800 16000 19200 22400 25600 28800 32000
Count
I
= 4mA + (count/32760) x 16.38mA
out
Count
16000
16007
16008
8 counts =
4µA
32767
12.004mA
12.000mA
16000
mA
12.000
12.000
12.004
11
IC200ALG320
12.012mA
12.008mA
16024
16016
16008
11-7
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