Delta AH500 - Page 221

Chapter 6 Applied Instructions
6-16
API Instruction code Operand
Function
0036~
0041
LD$※ S
1
, S
2
Comparing the strings
Device
X Y M S T C HC D L SM SR E PR K 16# “$” DF
S
1
         
S
2
         
Pulse instruction 16-bit instruction (5-17 steps) 32-bit instruction
-
AH500
-
Symbol:
Taking LD$= for example
S
1
：
Data source 1 String
S
2
：
Data source 2 String
Explanation:
1. The instructions are used to compare the data in S
1
with that in S
2
, and the data compared is
strings. Take the instruction LD$= for example. When the comparison result is that the data in
S
1
is equal to that in S
2
, the condition of the contact is met. When the comparison result is
that the data in S
1
is not equal to that in S
2
, the condition of the contact is not met.
API
number
Instruction
Comparison operation result
ON
OFF
0036
LD$＝ S
1
＝S
2
S
1
≠S
2
0037
LD$＜＞
S
1
≠S
2
S
1
＝S
2
0038
LD$＞ S
1
＞S
2
S
1
≦S
2
0039
LD$＞＝ S
1
≧S
2
S
1
＜S
2
0040
LD$＜ S
1
＜S
2
S
1
≧S
2
0041
LD$＜＝ S
1
≦S
2
S
1
＞S
2
2. Only when the data in S~S+n (n indicates the n
th
device) includes 16#00 can the data be
judged as a complete string.
16#31(1)
16#33(3)
16#32(2)
16#34(4)
16#35(5)
16#00
S
S+1
S+2
b15 b8
b7
b0
""12345
3. When two strings are the same, the corresponding comparison operation results of the
instructions are listed below.
16#41(A)
16#43(C)
16#42(
B)
16#44(D)
16#45(E)
16#00
S1
S1
S1
+1
+2
b15 b8
b7
b0
""ABCDE
16#41(A)
16#43(C)
16#42(B)
16#44(D)
16#45(E)
16#00
S2
S2
S2
+1
+2
b15 b8
b7
b0
""ABCDE
Comparison sign