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8 Using Expansion Units and Expansion I/O Units
8-34 CP1E CPU Unit Hardware User’s Manual(W479)
• The Analog I/O Unit will not start converting analog I/O values until the range code has
been written. Inputs will be 0000, and 0 V or 0 mA will be output.
• After the range code has been set, 0 V or 0 mA will be output for the 0 to 10V, -10 to 10V,
or 0 to 20mA ranges, and 1 V or 4 mA will be output for the 1 to 5V and 4 to 20mA
ranges until a convertible value has been written to the output word.
• 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.
(3) Reading Analog Input Conversion Values
The ladder program can be used to read the memory area words where the converted val-
ues are stored.
Values are output to the next two words (m + 1, m + 2) following the last input word (m) allo-
cated to the CPU Unit or previous Expansion Unit or Expansion I/O Unit.
(4) Writing Analog Output Set Values
The ladder program can be used to write data to the memory area where the set value is
stored.
The output word will be “n+1”, where “n” is the last output word allocated to the CPU Unit or
previous Expansion Unit or Expansion I/O Unit.
(5) Startup Operation
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 simultaneously with startup it will wait for valid conver-
sion data.
Analog input data will be 0000 until initial processing is completed. Analog output data will
be 0 V or 0 mA until the range code has been written. After the range code has been writ-
ten, the analog output data will be 0 V or 0 mA if the range is 0 to 10 V, -10 to 10 V, or 0 to
20 mA, or it will be 1 V or 4 mA if the range is 1 to 5 V or 4 to 20 mA.
word n+1
15
1 0 0 0 0 0 0
8 7 6 5 4 3 2 1 0
Analog
output Analog
input 1 Analog
input 0
MOV
#800A
n+1
First Cycle Flag
A200.11
Analog input 0: 4 to 20 mA
Analog input 1: 0 to 10 V
Analog output: -10 to 10 V
Example: The following instructions set analog input 0 to 4 to 20 mA, analog input 1 to 0 to 10 V,
and the analog output to -10 to 10 V.
MOV
2
D0
Always ON Flag
P_On
TIM5
#0002
T5
TIM 5 will start as soon as power turns ON.
After 0.1 to 0.2 s (100 to 200 ms), the input
for TIM 5 will turn ON, and the converted
data from analog input 0 that is stored in
CIO 2 will be transferred to D0.