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Analog I/O (XA CPU Units)
Section 5-5
Writing Analog Output SV
Data
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.
Startup Operation
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.
Handling Unit Errors
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.
!Caution
If an interrupt task program is executed continuously for more than 6 ms, the
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.
Bit
Function
A434.04
Analog Initialization Completed Flag
0: Initializing
1: Initialization completed
Summary of Contents for CP1H CPU UNITS - PROGRAMMING 05-2007
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Page 22: ...xxii...
Page 34: ...xxxiv Conformance to EC Directives 6...
Page 174: ...140 CP series Expansion I O Unit Wiring Section 3 6...
Page 370: ...336 Analog I O XA CPU Units Section 5 5...
Page 552: ...518 Trouble Shooting Section 8 7...
Page 595: ...561 Sample Application Section 9 12 Network Settings Network Tab Network Settings Driver Tab...
Page 598: ...564 Sample Application Section 9 12...
Page 642: ...608 Standard Models Appendix A...
Page 652: ...618 Dimensions Diagrams Appendix B...
Page 745: ...711 Connections to Serial Communications Option Boards Appendix F Connecting to Unit...
Page 746: ...712 Connections to Serial Communications Option Boards Appendix F...
Page 776: ...742 PLC Setup Appendix G...
Page 778: ...744 Specifications for External Power Supply Expansion Appendix H...
Page 786: ...752 Revision History...