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Analog Output Units
Allocation of Output
Words
Writing the Range Code
398
3. Ladder Program
Four output words are allocated, beginning from the first word following the
last I/O word allocated to the CPU Unit or already-connected Expansion I/O
Unit or Expansion Unit.
Analog Output Unit
Words n+1 to n+4
Write the output use and the range code to words n+1 and n+2. The D/A con-
version will start when the set data is transferred from the CPU Unit to the
Analog Output Unit.
15
0
Wd n+1
1
0
0
Set to 1.
15
0
1
0
0
Wd n+2
Set to 1.
Range Code
• The Analog Input Unit will not start converting analog I/O values until the
range code has been written. The output will be 0 V or 0 mA.
• From when the range code has been written until data in the analog out-
put convertible range is written, 0 V or 0 mA will be output in the 0 to 10 V,
-10 to +10 V, and 0 to 20 mA ranges, and 1 V or 4 mA will be output in the
1 to 5 V and 4 to 20 mA ranges.
• Once the range code has been set, it is not possible to change the setting
while power is being supplied to the CPU Unit. To change the I/O range,
turn the CPU Unit OFF then ON again.
8
7
6
5
0
0
0
0
0
Analog input 2
8
7
6
5
0
0
0
0
0
Analog input 4
Range code
Analog input signal range
000
10 to 10 V
001
0 to 10 V
010
1 to 5 V
011
0 to 20 mA
100
4 to 25 mA
Output use
0
No
1
Yes
Section 7-3
4
3
2
1
Analog input 1
4
3
2
1
Analog input 3
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