Chapter 7 Usage of Various Functions

5)I/O converstion characteristics

(1)Analog input characteristics

a)Voltage input

Digital output value

4000

2000

0

0V5V10V

Analog input voltage

Digital output value

2004

2003

2002

2001

2000

5.000V

5.0025V

 

 

 

Input Voltage

A/D conversion characteristics (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

Digital output value

4000

2000

0

 

 

0

10

20

Analog input current

Digital output value

2004

2003

2002

2001

2000

10.000

10.005

Input Current

A/D conversion characteristics (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.

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LG Electronics 120S user manual O converstion characteristics, Analog input characteristics Voltage input