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Analog Input Terminals
Section 5-7
When voltage is less than the input range (i.e., input voltage is less than
0.8 V), the burnout detection function is activated, and data becomes 7FFF.
0 to 20 mA
Currents between 0 mA and 20 mA correspond to 0000 to 1770 Hex (0 to
6000). The range of data that can be converted is FED4 to 189C Hex (–300 to
6300). When current is negative, it is expressed by 2
’
s complement (16 bits).
In the event of disconnection, the data becomes the same value as in the
case of 0 mA input (0000 Hex).
4 to 20 mA
Currents between 4 mA and 20 mA correspond to 0000 to 1770 Hex (0 to
6000). The range of data that can be converted is FED4 to 189C Hex (–300 to
6300). When current is less than the input range (i.e., input current is less
than 3.2 mA) the burnout detection function is activated, and data becomes
7FFF.
Switching between 4, 3, 2,
and 1 Inputs
It is possible to restrict the number of inputs with pins 1 and 2 of DIP switch
SW101. In this way, the sampling cycle can be set to 4 ms/4 points, 3 ms/3
Hexadecimal (decimal)
conversion data
Voltage
189C (6300)
1770 (6000)
FED4 (–300)
5 V 5.2 V
7FFF
0000 (0)
0.8 V
1 V
189C (6300)
1770 (6000)
0000 (0)
0 mA
FED4 (–300)
–1 mA
20 mA 21 mA
Hexadecimal (decimal)
conversion data
Current
Hexadecimal (decimal)
conversion data
Current
189C (6300)
1770 (6000)
FED4 (–300)
20 mA 20.8 mA
7FFF
0000 (0)
3.2 mA
4 mA