DL205 Analog Manual, 7th Edition Rev. D
12-10
Chapter 12: F2-02DAS-1, 4-20mA Isolated 2-Channel Analog Current Output
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D
Analog Data Bits
The first sixteen 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 16-bit resolution, the analog signal is converted into 65536 counts
ranging from 0-65535 (2
16
). For example, send a 0 to get a 4mA signal, and 65535 to get
a 20mA signal. This is equivalent to a binary value of 0000 0000 0000 0000 to 1111 1111
1111 1111, or 0000 to FFFF hexadecimal. The diagram below 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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BSLBSM
01
1
1
0
987654321
= databits
1
5
1
4
1
3
1
2
20mA
4mA
0 65535
4-- 20mA
Resolution =
H – L
65535
H = High limit of the signal range
L = Low limit of the signal range
16mA / 65535 = 0.2241 µA per count
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