Chapter 7 Usage of Functions
7- 5 5
7) 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
v
alue
2004
2002
2001
2000
2003
5.00
0V
5.00
25
V
Input Voltage
Digital output
v
alue
4000
2000
0
0V
5V
10V
Analog input voltage
A/D conversion characteristics (voltage input)
2004
2002
2001
2000
2003
10.0
0
0
㎃
10.0
0
5
㎃
Input Current
Digital output
v
alue
4000
2000
0
0
㎃
10
㎃
20
㎃
Analog input current
Digital output
v
alue
A/D conversion characteristics (Current input)
