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436
Analog I/O Units
Section 7-4
Reading Converted Analog Input Values
The ladder program can be used to read the memory area words where the
converted values are stored. Values are output to the next two words (m + 1,
m + 2) following the last input word (m) allocated to the CPU Unit or previous
Expansion Unit or Expansion I/O Unit.
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.
Startup Operation
After power is turned ON, it will require two cycle times plus approx. 50 ms
before the first data is converted. The following instructions can be placed at
the beginning of the program to delay reading converted data from analog
inputs until conversion is actually possible.
Analog input data will be 0000 until initial processing has been completed.
Analog output data will be 0 V or 0 mA until the range code has been written.
After the range code has been written, 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.
Handling Unit Errors
• When an error occurs in the Analog I/O Unit, analog input data will be
0000 and 0 V or 0 mA will be output as the analog output.
If a CPU error or an I/O bus error (fatal errors) occurs at the CPU Unit and
the analog output is set to 1 to 5 V or 4 to 20 mA, 0 V or 0 mA will be out-
put. For any other fatal errors at the CPU Unit, 1 V or 4 mA will be output.
• Expansion Unit and Expansion I/O Unit errors are output to bits 0 to 6 of
word A436. The bits are allocated from A436.00 in order starting from the
Unit nearest the CPU Unit. Use these flags in the program when it is nec-
essary to detect errors.
Programming Example
This programming example uses these ranges:
Analog input 0: 0 to 10 V
Analog input 1: 4 to 20 mA
Analog output: 0 to 10 V
MOV(021)
2
D0
Always ON Flag
P_On
T5
#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
word 2 will be transferred to D00000.
Summary of Contents for CP1L - 12-2007
Page 3: ...iv...
Page 9: ...x...
Page 13: ...xiv TABLE OF CONTENTS...
Page 21: ...xxii...
Page 33: ...xxxiv Conformance to EC Directives 6...
Page 65: ...32 Function Blocks Section 1 5...
Page 428: ...395 Clock Section 6 9...
Page 429: ...396 Clock Section 6 9...
Page 523: ...488 Troubleshooting Unit Errors Section 9 4...
Page 531: ...496 Replacing User serviceable Parts Section 10 2...
Page 563: ...528 Auxiliary Area Allocations by Function Appendix C...
Page 611: ...576 Auxiliary Area Allocations by Address Appendix D...
Page 638: ...603 Connections to Serial Communications Option Boards Appendix F Connecting to Unit...
Page 639: ...604 Connections to Serial Communications Option Boards Appendix F...
Page 669: ...634 Index...
Page 671: ...636 Revision History...