7 APPLICATION INSTRUCTION
7.6 Character string operation instruction
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7
7.6 Character string operation instruction
Comparing character strings
LD$, AND$, OR$
These instructions perform a comparison operation between the character string data in the device specified by (s1) and later
and the character string data in the device specified by (s2) and later. (Devices are used as a normally open contact.)
■Descriptions, ranges, and data types
■Applicable devices
*1 T, ST, C cannot be used.
• These instructions perform a comparison operation between the character string data specified by (s1) and the character
string data specified by (s2). (Devices are used as a normally open contact.)
• In the comparison operation, the ASCII codes of the character strings are compared one by one from the start of the
strings.
• Character strings in the devices specified by (s1) and (s2) to a device that stores 00H are compared.
Ladder diagram Structured text
($=, $<>, $>, $<=, $<, or $>= enters .)
Not supported
Operand Description Range Data type Data type (label)
(s1) Comparison data or head device number where the comparison
data is stored
Character string Character string
(s2) Comparison data or head device number where the comparison
data is stored
Character string Character string
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 $
(s1)
*1
(s2)
*1
• When all the character strings match, the comparison is considered as matched.
LD
AND
OR
(s1) (s2)
(s1) (s2)
(s1) (s2)
b15
(s1)
(s1)+1
(s1)+2
42H (B)
b8
41H (A)
b7 b0
43H (C)44H (D)
45H (E)00H
"ABCDE"
b15
(s2)
(s2)+1
(s2)+2
42H (B)
b8
41H (A)
b7 b0
43H (C)44H (D)
45H (E)00H
"ABCDE"
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