254
Analog Input Functions and Operating Procedures
Section 6-6
6-6-2
Mean Value Processing
The Analog I/O Unit can compute the mean value of the conversion values of
analog inputs that have been previously sampled. Mean value processing
involves an operational mean value in the history buffers, so it has no effect on
the data refresh cycle. (The number of history buffers that can be set to use
mean value processing is 2, 4, 8, 16, 32, or 64.)
When “n” number of history buffers are being used, the first conversion data
will be stored for all “n” number of history buffers immediately after data con-
version has begun or after a disconnection is restored.
When mean value processing is used together with the peak value hold func-
tion, the mean value will be held.
To specify whether or not mean value processing is to be used, and to specify
the number of history buffers for mean data processing, use a Programming
Device to make the settings in D(m+6) to D(m+9) as shown in the following
table.
For the DM word addresses, m = (unit number x 100)
Note
After making the DM settings from a Programming Device, it will be necessary
to either turn the power to the PLC OFF and ON, or turn ON the Special I/O
Unit Restart Bit to transfer the contents of the DM settings to the Special I/O
Unit.
The history buffer operational means are calculated as shown below. (In this
example, there are four buffers.)
Conversion data
Buffer 1
Buffer 2
Buffer 3
Buffer 4
Buffer n
(Mean value
processing)
Conversion value
(Values stored in
CIO words n+5 and
n+8)
(Discarded)
DM word
Function
Set value
D(m+6)
Input 1 mean value processing
0000: Mean value processing with 2 buffers
0001: No mean value processing
0002: Mean value processing with 4 buffers
0003: Mean value processing with 8 buffers
0004: Mean value processing with 16 buffers
0005: Mean value processing with 32 buffers
0006: Mean value processing with 64 buffers
D(m+7)
Input 2 mean value processing
D(m+8)
Input 3 mean value processing
D(m+9)
Input 4 mean value processing
Summary of Contents for CJ1W-AD041-V1
Page 3: ...iv...
Page 5: ...vi...
Page 9: ...x TABLE OF CONTENTS...
Page 15: ...xvi...
Page 99: ...76 Handling Errors and Alarms Section 2 8...
Page 191: ...168 Handling Errors and Alarms Section 4 8...
Page 243: ...220 Handling Errors and Alarms Section 5 8...
Page 381: ...358 Handling Errors and Alarms Section 7 10...
Page 385: ...362 Dimensions Appendix A...
Page 395: ...372 Sample Programs Appendix B...
Page 396: ...373 Appendix C Data Memory Coding Sheets...
Page 417: ...394 Data Memory Coding Sheets Appendix C...
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