AutomationDirect DL205 - Analog Data Bits; Module Resolution

DL205 Analog Manual, 7th Edition Rev. D
8-10
Chapter 8: F2-02DA-1, F2-02DA-1L, 2-Channel Analog Current Output
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Analog Data Bits
The first twelve bits represent the analog
data in binary format.
Bit Value Bit Value
0 1 8 256
1 2 9 512
2 4 10 1024
3 8 11 2048
4 16 12 4096
5 32 13 8192
6 64 14 16384
7 128 15 32768
Module Resolution
Since the module has 12-bit resolution, the
analog signal is converted into 4096 counts
ranging from 0 - 4095 (2
12
). For example,
send a 0 to get a 4mA signal and 4095 to
get a 20mA signal. This is equivalent to a
binary value of 0000 0000 0000 to 1111
1111 1111, or 000 to FFF hexadecimal. The
diagram shows how this relates to the signal
range. Each count can also be expressed
in terms of the signal level by using the
equation shown.
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V40501
BSLBSM
01
1
1
0
987654321
= databits
20mA
4mA
0 4095
4-- 20mA
Resolution =
H − L
4095
H=high limitofthe signalrange
L=lowlimit of thesignalrange
16mA/4095=3.907 Aper count
μ