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Chapter 7 Usage of Various Functions
7-45
5) I/O converstion characteristics
(1) Analog input characteristics
a) Voltage input
In voltage input, digital amount 0 is output by 0V input and 4,000 is output by 10V input. Therefore input 2.5mV equals to
digital amount 1, but value less than 2.5mV can’t be converted.
b) Current input
Current input 0mA becomes output 0, 10mA does 2000 and 20mA does 4000. therefore input 5 equals to digital
amount 1, but value less tan 5 can’t be converted. So abandon it.
Digital output value
Input Voltage
Digital output value
A
nalo
g
input volta
g
e
A/D conversion characteristics (voltage input)
Input Current
Digital output value
A
nalo
g
in
p
ut current
Digital output value
A/D conversion characteristics (Current input)