Delta AH500 - Page 217

Chapter 6 Applied Instructions
6-12
API Instruction code Operand
Function
0018~
0023
D
FLD※ S
1
, S
2
Comparing the floating-point
numbers
Device
X Y M S T C HC D L SM SR E PR K 16# “$” DF
S
1
          
S
2
          
Pulse instruction 32-bit instruction (5-7 steps) 64-bit instruction (5-7 steps)
－
AH500
AH500
Symbol:
Taking FLD= and DFLD= for example
S
1
：
Data source 1 Double word/Long word
S
2
：
Data source 2 Double word/Long word
Explanation:
1. The instructions are used to compare the value in S
1
with that in S
2
, and the values
compared are floating-point numbers. Take the instruction FLD= 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.
API
number
32-bit
instruction
64-bit
instruction
Comparison operation result
ON
OFF
0018
FLD＝ DFLD＝ S
1
＝S
2
S
1
≠S
2
0019
FLD＜＞ DFLD＜＞
S
1
≠S
2
S
1
＝S
2
0020
FLD＞ DFLD＞ S
1
＞S
2
S
1
≦S
2
0021
FLD＞＝ DFLD＞＝ S
1
≧S
2
S
1
＜S
2
0022
FLD＜ DFLD＜ S
1
＜S
2
S
1
≧S
2
0023
FLD＜＝ DFLD＜＝ S
1
≦S
2
S
1
＞S
2
Example:
Take the instruction FLD＝ for example. When the value in D0 is equal to that in D2, Y0.0 is ON.
Additional remark:
1. If the value in S
1
or S
2
exceeds the range of values which can be represented by the
floating-point numbers, the contact is OFF, SM is ON, and the error code in SR0 is 16#2013.