Delta AH500 - Explanation of Comparison Instructions

Chapter 6 Applied Instructions
6-6
6.1.2 Explanation of Comparison Instructions
API Instruction code Operand
Function
0000~
0005
D
LD※ S
1
, S
2
Comparing the values
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 steps) 32-bit instruction (5 steps)
－
AH500 AH500
Symbol:
Taking LD= and DLD= for example
S
1
：
Data source 1
Word/Double word
S
2
：
Data source 2
Word/Double word
Explanation:
1. The instructions are used to compare the value in S
1
with that in S
2
. Take the instruction LD=
for example. When the comparison result is that the value in S
1
is equal to that in S
2
, the
condition of the instruction is met. When the comparison result is that the value in S
1
is not
equal to that in S
2
, the condition of the instruction is not met.
2. Only the 32-bit instruction can use the 32-bit counter.
API
number
16-bit
instruction
32-bit
instruction
Comparison operation result
ON
OFF
0000
LD＝ DLD＝ S
1
＝S
2
S
1
≠S
2
0001
LD＜＞ DLD＜＞
S
1
≠S
2
S
1
＝S
2
0002
LD＞ DLD＞ S
1
＞S
2
S
1
≦S
2
0003
LD＞＝ DLD＞＝ S
1
≧S
2
S
1
＜S
2
0004
LD＜ DLD＜ S
1
＜S
2
S
1
≧S
2
0005
LD＜＝ DLD＜＝ S
1
≦S
2
S
1
＞S
2
Example:
1. When the value in C10 is equal to 200, Y0.10 is ON.
2. When the value in D200 is greater than -30, Y0.11 keeps ON.
3. When the value in (C201, C200) is less than 678,493, or when M3 is ON, M50 is ON.