Omron CP1H CPU Operation Manual page 369

Analog I/O (XA CPU Units)
Writing Analog Output SV
Data
Startup Operation
Handling Unit Errors
!Caution If an interrupt task program is executed continuously for more than 6 ms, the
The ladder program can be used to write data to the memory area words
where the set value is stored. Write the output SV data to CIO 210 to CIO
211.
The Analog Initialization Completed Flag (A434.04) indicates when the built-in
analog I/O has been initialized.
Bit
A434.04 Analog Initialization Completed Flag
After power is turned ON, it takes approximately 1.5 s before the initial data is
converted and stored in the input words. The Analog Initialization Completed
Flag (A434.04) will go ON when initial processing is completed. If the system
starts operating, use this flag in the program to delay reading converted data
from analog inputs until the data is valid.
When an error occurs in the built-in analog I/O system, analog input data will
be set to 0000 and the analog output will be set to 0 V or 0 mA.
If a CPU error occurs, the analog output will be set to is set to 0 V or 0 mA
even if the output range is 1 to 5 V or 4 to 20 mA. For any other fatal errors in
the CPU Unit, 1 V or 4 mA will be output if the output range is 1 to 5 V or 4 to
20 mA.
built-in analog function will not operate properly and a Built-in Analog Error
will occur. When using the built-in analog function, design the system so that
interrupt task programs are not executed too long or too frequently. Test the
system thoroughly in trial operation before operating the system.
Section 5-5
Function
0: Initializing
1: Initialization completed
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