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406
Analog Input Units
Section 7-2
For example, if analog input device 2 is outputting 5 V and the same power
supply is being used as shown above, about 1/3, or 1.6 V, will be applied at
the input for input device 1.
Consider the following information on open input circuits when using voltage
inputs. Either use separate power supplies, or install an isolator at each input.
If the same power supply is used as shown in the following diagram and an
open circuit occurs at point A or B, an unwanted current flow will occur as
shown by the dotted lines in the diagram, creating a voltage at the other input
of about 1/3 to 1/2. If the 1 to 5-V range is being used, the open-circuit detec-
tion function will not operate. Also, if there is an open circuit at C, the open-cir-
cuit detection function will not operate because the negative sides are the
same.
Allocating I/O Words
Four input words and two output words are allocated from the next words fol-
lowing the last I/O words allocated to the CPU Unit or an existing Expansion
Unit or Expansion I/O Unit.
Writing Set Data
Write the settings for input use, averaging use, and range codes for words n+1
and n+2. When the set data is transferred from the CPU Unit to the Analog I/O
Unit, the A/D conversion will be started.
A
C
B
Analog
input
device
1
Analog
input
device
2
24 VDC
3. Creating the Ladder Program
Words (m+1) to (m+4)
Analog Input Unit
Words (n+1), (n+2)
Содержание CP1L-L14D Series
Страница 2: ...CP1L L14D CP1L L20D CP1L M30D CP1L M40D CP1L CPU Unit Operation Manual Revised June 2007...
Страница 3: ...iv...
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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 153: ...120 CP CPM1A series Expansion I O Unit Wiring Section 3 6...
Страница 523: ...490 Troubleshooting Unit Errors Section 9 4...
Страница 531: ...498 Replacing User serviceable Parts Section 10 2...
Страница 563: ...530 Auxiliary Area Allocations by Function Appendix C...
Страница 611: ...578 Auxiliary Area Allocations by Address Appendix D...
Страница 638: ...605 Connections to Serial Communications Option Boards Appendix F Connecting to Unit...
Страница 639: ...606 Connections to Serial Communications Option Boards Appendix F...
Страница 669: ...636 Index...
Страница 671: ...638 Revision History...