Table of Contents
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Analog Input Units
Averaging
Reading Analog Input
Conversion Values
Startup Operation
Handling Unit Errors
15
1
0
0
0
0
Wd (n+1)
Set to 1.
15
Wd (n+2)
1
0
0
0
0
Set to 1.
Set Data
• The Analog Input Unit will not start converting analog I/O values until the
range code has been written.
• 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.
Set whether averaging is to be used for set data. When the averaging bit is set
to 1, the average (moving average) for the past eight inputs is output as con-
version data.
Read the conversion value storage area with the ladder program. With word m
as the last input word allocated to the CPU Unit or an already-connected
Expansion Unit, the A/D conversion data will be output to the following words
m+1 to m+4.
After the power is turned ON, it will require two cycle times plus approximately
50 ms before the first conversion data is stored in the input words. Therefore,
create a program as shown below, so that when operation begins simulta-
neously with startup it will wait for valid conversion data.
The analog input data will be 0000 until the initial processing is completed.
Power ON
P_On
T5
MOV(021)
• When an error occurs in an Analog Input Unit, the analog input conversion
data becomes 0000.
8
7
6
5
4
3
2
1
0
0
0
Analog input 1
Analog input 2
8
7
6
5
4
3
2
1
0
0
0
Analog input 4
Analog input 3
Range code
Analog input signal range
10 to 10 V
00
0 to 10 V
01
1 to 5 V or 4 to 20 mA
10
0 to 5 V or 0 to 20 mA
11
Averaging
0
No
1
Yes
Input Use
0
No
1
Yes
TIM5 is started when the power is
T 5
turned ON. After 0.1 to 0.2 s (100 to
200 ms) elapses, the TIM5 contact
#0002
turns ON and the analog input 1 con-
version data stored in word 2 is trans-
ferred to DM0.
2
D 0
Section 7-2
0
0
391
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