
392
7 APPLICATION INSTRUCTION
7.6 Character string operation instruction
Extracting character string data from the left
LEFT(P)
These instructions extract "n" characters of the character string data stored in the device specified by (s) and later from the left
end (from the start), and store the extracted characters in the device specified by (d) and later.
*1
The LEFT instruction is not supported by the ST language. Use LEFT of the standard function.
Setting data
■
Descriptions, ranges, and data types
■
Applicable devices
*1
T, ST, C cannot be used.
Processing details
• These instructions extract "n" characters of the character string data stored in the device specified by (s) and later from the
left end (from the start), and store the extracted characters in the device specified by (d) and later.
• A character string stored in (s) indicates data stored in devices from the specified device until "00H" is first detected in units
of 1 byte.
Ladder diagram
Structured text
ENO:=LEFTP(EN,s,n,d);
Operand
Description
Range
Data type
Data type (label)
(s)
Character string or head device number storing a character string
Character string
Character string
(d)
Head device number for storing "n" characters extracted from the
left of the device specified by (s)
Character string
Character string
(n)
Number of characters to be extracted
1 to 16383
16-bit unsigned binary
ANY16
Operand
Bit
Word
Double word
Indirect
specification
Constant
Others
X, Y, M, L,
SM, F, B, SB
U
\G
T, ST,
C, LC
T, ST, C, D,
W, SD, SW, R
U
\G
Z
LC
LZ
K, H
E
$
(s)
(d)
(n)
(s)
(d)
(n)
00H
00H
b15
b0
b7
b8
b15
b0
b7
b8
(s)
(s)+1
(d)
(d)+1
ASCII code for 1st character
ASCII code for 2nd character
ASCII code for 3rd character
ASCII code for 4th character
ASCII code for 1st character
ASCII code for 2nd character
ASCII code for 3rd character
ASCII code for 4th character
ASCII code for (n-1) th
character
ASCII code for (n-2) th
character
ASCII code for (n-1) th
character
ASCII code for (n-2) th
character
ASCII code for (n) th
character
ASCII code for (n+1) th
character
ASCII code for (n) th
character
ASCII code for the last
character
Summary of Contents for MELSEC iQ-F FX5 series
Page 1: ...MELSEC iQ F FX5 Series Programming Manual Instructions Standard Functions Function Blocks ...
Page 2: ......
Page 21: ...19 PART 1 PART 1 OVERVIEW Part 1 consists of the following chapter 1 OVERVIEW ...
Page 98: ...96 4 STANDARD FUNCTIONS FUNCTION BLOCKS 4 2 Standard Function Blocks MEMO ...
Page 840: ...838 23 TIME DATA FUNCTIONS 23 4 Division MEMO ...
Page 887: ......