Chapter 7 Usage of Functions
7-
５５
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
Ꮃ
equals to digital amount
1, but value less tan 5
Ꮃ
can’ t be converted. So abandon it.
Digital output value
2004
2002
2001
2000
2003
5.000V
5.0025V
Input voltage
Digital output value
4000
2000
0
0V
5V
10V
Analog input voltage
A/D conversion characteristics (voltage input)
2004
2002
2001
2000
2003
10.000
Ꮄ
10.005
Ꮄ
Input Current
Digital output value
4000
2000
0
0
Ꮄ
10
Ꮄ
20
Ꮄ
Analog input current
Digital output value
A/D conversion characteristics (Current input)
