LG G4F-DA2V - D-Digital Value; Digital; Analog Conversion Characteristics

Chapter 1. INTRODUCION
1 - 2
Analog value is a sequentially changing value such as voltage, current, temperature, speed, pressure,
flux, etc.
Temperature, for example, is sequentially changing according to the time. Because this temperature is
not inputted on the PLC directly, the same analog value of DC voltage (0 to 10V) or current (4 to 20mA)
in accordance with the temperature should be input on the PLC through transducer.
1.2.2 D - Digital Value
Digital value is non-sequentially changing value written
as the number like 0, 1, 2, 3. The signal of on or off is
written as digital value of 0 or 1. There are BCD value
and binary value in the range of digital value.
Analog value isn't written directly on the CPU. For
analog input to the CPU operation, analog converted
to digital value has to be input on the CPU. and for
analog output, the digital of CPU should be converted
to analog.
1.2.3 Digital/ Analog Conversion Characteristics
1) Voltage output - G3F-DA3V
[Fig 1.5] D/A conversion characteristics(Voltage output)
Number of man
time
[Fig. 1.3] Digital quality
A/D
Conversion
CPU
(Digital
processing)
D/A
Conversion
Analog
0~10V,1~5V
or 4~20mA
Analog
0~
±
10V or
4~20mA
[Fig. 1.4] conversion processing
in the PLC
Analog Output Voltage
10V
5V
0V
0
2000 4000
Digital Input Value
20042000 2001 2002 2003
Digital Input
Analog Output Voltage
2005
5.0025V
5V
2.5
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