434
Analog Output Units Section 7-3
■ 0 to 20 mA
The hexadecimal values 0000 to 1770 (0 to 6000) correspond to an analog
current range of 0 to 20 mA. The entire output range is 0 to 21 mA.
■ 4 to 20 mA
The hexadecimal values 0000 to 1770 (0 to 6000) correspond to an analog
current range of 4 to 20 mA. The entire output range is 3.2 to 20.8 mA.
Procedure
Writing D/A Conversion
Data
Conversion
Data
Hexadecimal
(Decimal)
0 mA
20 mA
21 mA
189C
(6300)
1770
(6000)
7FFF
8000
0000 (0)
Conversion
Data
Hexadecimal
(Decimal)
4 mA
20 mA
20.8 mA
3.2 mA
189C
(6300)
1770
(6000)
0 mA
7FFF
FED4
(−300)
8000
Connect and wire Units.
Create a ladder program
• Connect Analog Output Units.
• Wire to analog input devices.
• Write range code to output words (n+1, n+2).
• Set use of outputs.
• Select output signals using range codes.
• Write D/A conversion values to output words
(n+1 to n+4).
MOV
(n+1) CH
Range code (outputs 1, 2)
(n+2) CH
Range code (outputs 3, 4)
(n+1) CH
(n+2) CH
Analog output 2 conversion value
(n+3) CH
Analog output 3 conversion value
(n+4) CH
Analog output 4 conversion value
CPU Unit
Analog Output Unit
Ladder program
Writes the range code.
Writes the converted
values.
Analog output 1 conversion value
Where "n" is the last output word
allocated to the CPU Unit, or
previous Expansion Unit or
Expansion I/O Unit.
Analog devices
Adjustment equipment
Servo Controller
Variable speed device
Recorder
Other
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