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421
Analog I/O Units
Section 7-4
Reading A/D Conversion Tables
Data converted from analog to digital is output to bits 00 to 07 in words m+1
and m+2.
Note
The Open-circuit Detection Flag is turned ON if the input signal range is set to
1 to 5 V or 4 to 20 mA and the input signal falls below 1 V or 4 mA. (Open cir-
cuits are not detected when the input signal range is set to 0 to 10 V.)
MOV(21)
MOVE instruction
Ladder program
Range code
Word n + 1
Word m + 1
Word m + 2
CPU Unit
Analog I/O Unit
Writes the range
code. Reads the
conversion value.
Analog input 1
conversion value
Analog input 2
conversion value
"m" is the last input word and "n" is the last
output word allocated to the CPU Unit, or
previous Expansion Unit or Expansion I/O Unit.
Analog devices
· Temperature sensor
· Pressure sensor
· Speed sensor
· Flow sensor
· Voltage/current meter
m + 1
15
m + 2
15
00
07
07
00
Analog input 1
Open-circuit
Detection Flag
0:
Normal
1:
Open-circuit
Analog input 1 conversion value (00 to FF hex)
Analog input 2
Open-circuit
Detection Flag
0:
Normal
1:
Open-circuit
Analog input 2 conversion value (00 to FF hex)
Содержание CP1L - 12-2007
Страница 3: ...iv...
Страница 9: ...x...
Страница 13: ...xiv TABLE OF CONTENTS...
Страница 21: ...xxii...
Страница 33: ...xxxiv Conformance to EC Directives 6...
Страница 65: ...32 Function Blocks Section 1 5...
Страница 428: ...395 Clock Section 6 9...
Страница 429: ...396 Clock Section 6 9...
Страница 523: ...488 Troubleshooting Unit Errors Section 9 4...
Страница 531: ...496 Replacing User serviceable Parts Section 10 2...
Страница 563: ...528 Auxiliary Area Allocations by Function Appendix C...
Страница 611: ...576 Auxiliary Area Allocations by Address Appendix D...
Страница 638: ...603 Connections to Serial Communications Option Boards Appendix F Connecting to Unit...
Страница 639: ...604 Connections to Serial Communications Option Boards Appendix F...
Страница 669: ...634 Index...
Страница 671: ...636 Revision History...