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8 Using Expansion Units and Expansion I/O Units
CP1E CPU Unit Hardware User’s Manual(W479)
8-
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(4) Reading Analog Input Conversion Values
The ladder program can be used to read the memory area words where the converted val-
ues are stored.
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.
(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 the ladder can start to operate with valid conversion data in input words.
The analog input data will be 0000 until the first conversion data is stored in the input
words.
(6) Handling Unit Errors
•
When an error occurs in an Analog Input Unit, the analog input conversion data
becomes 0000.
•
Expansion Unit errors are output to bits 0 to 5 of word A436 for Units 1 to 3. The bits are
allocated from A436.00 in order starting with the Unit nearest the CPU Unit. CP1W-
AD041 is allocated two bits each. Use these flags in the program when it is necessary to
detect errors.
MOV
2
D0
TIM
0005
#0002
T0005
Always ON Flag
P_On
TIM0005 is started when the power is turned
ON. After 0.2 s (200 ms) elapses, the TIM0005
contact turns ON and the analog input 1 con-
version data stored in CIO 2 is transferred to
D0.
Summary of Contents for CP1E-E**D Series
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Page 66: ...2 Basic System Configuration and Devices 2 22 CP1E CPU Unit Hardware User s Manual W479...
Page 318: ...Appendices A 54 CP1E CPU Unit Hardware User s Manual W479...
Page 322: ...Index 4 CP1E CPU Unit Hardware User s Manual W479...
Page 324: ...Revision 2 CP1E CPU Unit Hardware User s Manual W479...
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