405
Analog Output Units Section 7-3
Writing Analog Output Set
Values
The ladder program can be used to write data to the output word where the
set value is stored. The output word will be “n+1” when “n” is the last output
word allocated to the CPU Unit, or previous Expansion Unit or Expansion I/O
Unit.
Startup Operation After power is turned ON, it will require two cycle times plus approximately 50
ms before the first data is converted.
The following table shows the output status after the initial processing is com-
pleted.
Therefore, create a program as shown below, so that when operation begins
simultaneously with startup it will wait for valid set data.
Handling Unit Errors • When an error occurs at the Analog Output Unit, the analog output will be
0 V or 0 mA. If a CPU Unit fatal error occurs when analog outputs are set
in the 1 to 5 V or 4 to 20 mA range, 0 V or 0 mA will be output for a CPU
error I/O bus error, and 1 V or 1 mA will be output for all other errors.
• CP-series Expansion Unit errors are output to bits 0 to 6 of word A436.
The bits are allocated from A436.00 in order starting with the Unit nearest
the CPU Unit. Use these flags in the program when it is necessary to
detect errors.
Program Example
Output type Voltage output Current output
Output range 0 to 10 V,
-10 to +10 V
1 to 5 V 0 to 20 mA 4 to 20 mA
Before range
code is written
0 V 0 mA
After range
code is written
0 V 1 V 0 mA 4 mA
MOV(021)
D100
102
P_On
T 5
#0002
T5
Always ON Flag
TIM 005 will start as soon as power
turns ON. After 0.1 to 0.2 s (100 to
200 ms), the Completion Flag for
TIM 005 will turn ON, and the data
stored in DM 0100 will be moved to
IR 102 as the conversion data for
analog output 1.
Analog output Output range Range code Set data Destination
word
Output 1 0 to 10 V 001 1001 (9 hex) Wd n+1
Output 2 4 to 20 mA 100 1100 (C hex) Wd n+1
Output 3 -10 to 10 V 000 1000 (8 hex) Wd n+2
Output 4 Not used. -(000) 0000 (0 hex) Wd n+2
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