Delta AH500 Programming Manual page 666

AH 5 00 Pr ogr am m ing Ma n ua l
API Instruction code
2121 FREXP
Device X Y M
 
S
1
 
S
2
 
D
Symbol:
Explanation:
The binary-coded decimal floating-point number in S
first, and then the decimal point in the floating-point number is moved to the left in accordance with
the setting of S . The final result is stored in D.
2
Binary -coded deci mal
floati ng- point number
The binary-coded decimal floating-point number format:
1. If the binary-coded decimal floating-point number is a positive number, the value in S
the binary-coded decimal floating-point number is a negative number, the value in S
2. The seven-digit binary-coded decimal number is stored in (S
3. If the exponent is a positive number, the value in S
number, the value in S
4. S +4: The exponent
1
The value in S +4 should be within the range between 0 and 38.
1
5. S : The number of places
2
The value in S should be within the range between 0 and 7.
2
Example:
When the conditional contact MO is ON, the binary-coded decimal floating-point number is
converted into the floating-point number.
6 - 4 9 8
Operand
P
S , S , D
1 2
S T C HC D
  
  
  
Pulse instruction 16-bit instruction (7 steps)
AH500
Binary-coded decimal
：
S
1
floating-point number
： Number of places
S
2
D ： Conversion result
Sign
S eve n- di gi t
b in ar y-co de d
d eci mal nu mbe r
S ig n ( Exp on en t)
Exponent
Number of pl ac es
+3 is 1.
1
Converting the Binary-coded
decimal floating-point number into
the floating-point number
L SM SR E PR
  
   
  
AH500
is converted into the floating-point number
1
S 1
S 1
+1
D +1
S 1
+2
S 1
+3
S 1
+4
F loating-point number
S 2
+2, S +1).
1 1
+3 is 0. If the exponent is a negative
1
Function
K 16# "$" DF
 
32-bit instruction
-
Word
Word
Double word
D
is 0. If
1
is 1.
1