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Analog I/O Terminals Section 4-8
0 to 20 mA
The 0- to 20-mA range corresponds to the hexadecimal values 0000 to 7530
(0 to 30,000). The convertible data range is FA24 to 7B0C (–1,500 to 31,500).
When the current is negative, the negative number is expressed as a two’s
complement.
4 to 20 mA
The 4- to 20-mA range corresponds to the hexadecimal values 0000 to 7530
(0 to 30,000). The convertible data range is FA24 to 7B0C (–1,500 to 31,500).
The 3.2- to 4-mA range corresponds to the hexadecimal values FA24 to 0000
(–1,500 to 0). If the current drops below the input range (i.e., if the current volt-
age drops below 3.2 mA), the open-circuit detection function is activated and
the data is set to 7FFF.
Number of Inputs Setting
(DRT1-AD04 Only)
The number of inputs can be limited to two by turning ON pin 9 of the DIP
switch. Changing the number of inputs from four to two reduces the sampling
time from 8 ms/4 inputs to 4 ms/2 inputs, which provides faster conversion.
If the number of inputs is two, the number of words allocated to the Input Ter-
minal in the PLC is also reduced to 2 words. When only two inputs are used,
inputs 0 and 1 are used (inputs 2 and 3 cannot be used.)
Converted data
Hexadecimal (decimal)
Current
7B0C (31500)
7530 (30000)
–1 mA
0 mA 20 mA 21 mA
FA24 (-1500)
0000 (0)
Converted data
Hexadecimal (decimal)
Current
7B0C (31500)
7530 (30000)
7FFF
0000 (0)
FA24 (–1500)
3.2 mA
4 mA
20 mA 20.8 mA
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