7 APPLICATION INSTRUCTIONS
7.20 Data Processing Instructions
909
7
Processing details
• These instructions search the (n) points of data in units of 32-bit binary data (2
(n) points of data in units of 16 bits) from
the device specified by (s2), using the 16-bit binary data in the device specified by (s1) as a keyword. Each instruction
stores the number of data which matches the keyword in the device specified by (d)+1 and also stores the relative value of
the first-matched device number from (s2) in the device specified by (d).
• If the value specified in (n) is 0, no processing is performed.
• If no matching data is found as the result of search, 0 is stored in the devices specified by (d) and (d)+1.
• If the data to be searched by the DSERDATA(P) instruction has been sorted in ascending order, turning on
SM702
*1
enables a binary search which can process the search faster. If SM702 is turned on even though
the data to be search has not been sorted in ascending order, normal search results cannot be obtained.
The following figure shows an example of binary search.
*1 SM702 is a special relay for setting the search method.
SM702 is off: Sequential search (linear search)
This method compares the search data with the data to be searched for starting from the start of data
SM702 is on: Binary search
For the data that has been sorted in ascending order, this method checks the center value of the search range, determining whether the
center value is larger or smaller than the search value, and thereby narrows the search range to either side. Thus, target data is
searched for by repeating this processing.
Operation error
There is no operation error.
1
2
(d)+1
(s2)+3, (s2)+2
(s2)+5, (s2)+4
(s2)+(n)-3, (s2)+(n)-4
(s2)+(n)-1, (s2)+(n)-2
5678901
(d)
(s1)+1, (s1)
(s2)+1, (s2)
-1
5678901
5678901
0
5678901
123456
5678901
Location
Number of matches
Search range:
2 × (n) points
Search result
Data
matched
Start device number of search range
Search data
Relative value
500
400
600
200
300
100
700
500
400
600
200
300
100
700
500
400
600
200
300
100
700
500
Search
range
Compared with
the search data
Search
range
Compared with
the search data
Search
range
Search data
Compared with
the search data
Data to be searched
Data to be searched
Data to be searched
Search order
Summary of Contents for MELSEC iQ-R Series
Page 1: ...MELSEC iQ R Programming Manual Instructions Standard Functions Function Blocks ...
Page 2: ......
Page 24: ...22 INDEX 2092 INSTRUCTION INDEX 2093 REVISIONS 2104 WARRANTY 2105 TRADEMARKS 2106 ...
Page 34: ...32 MEMO ...
Page 35: ...33 PART 1 PART 1 OVERVIEW This part consists of the following chapter 1 OVERVIEW ...
Page 68: ...66 1 OVERVIEW 1 5 Precautions on Programming MEMO ...
Page 1448: ...1446 14 REDUNDANT SYSTEM INSTRUCTIONS 14 2 Disabling Enabling System Switching MEMO ...
Page 1972: ...1970 33 TIME DATA TYPE FUNCTIONS 33 4 Division MEMO ...
Page 2067: ...APPX Appendix 5 PID Control Program Examples 2065 A 252 Set PID control data for loop 2 ...
Page 2109: ......