Mitsubishi Electric MELSEC-Q/L - Addition and Subtraction of Floating-Point Data (Double Precision)

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6 BASIC INSTRUCTIONS
6.2 Arithmetic Operation Instructions
Addition and subtraction of floating-point data (double precision)
ED+(P), ED-(P) [When two data are set]
Processing details
■ED+
• Adds the 64-bit floating decimal point type real number designated at (D) and the 64-bit floating decimal point type real
number designated at (S), and stores the sum in the device designated at (D).
• Values which can be designated at (S) and (D) and which can be stored, are as follows:
0, 2
-1022
 | Designated value (stored value) | < 2
1024
• When an input value is set using a programming tool, a rounding error may occur. For precautions, refer to Page 89
Precautions.
■ED-
• Subtracts a 64-bit floating decimal point type real number designated by (D) and a 64-bit floating decimal point type real
number designated by (S), and stores the result at a device designated by (D).
• Values which can be designated at (S) and (D) and which can be stored, are as follows:
0, 2
-1022
 | Designated value (stored value) | < 2
1024
• When an input value is set using a programming tool, a rounding error may occur. For precautions, refer to Page 89
Precautions.
(S): Data for adding/subtracting or head number of the devices where the data for adding/subtracting is stored (real number)
(D): Head number of the devices where the data to be added to/subtracted from is stored (real number)
Setting
data
Internal device R, ZR J\ U\G Zn Constant
E
Others
Bit Word Bit Word
(S)   
(D)   
Universal LCPU
Basic
High
performance
Process Redundant
Command
Command
P
S
D
S D
ED+, ED-
ED+P, ED-P
indicates an instruction symbol of ED+/ED-.
+3
64-bit floating-point
real number
D
+2
D
D
+1
D
+3
64-bit floating-point
real number
S
+2
S
S
+1
S
+3
64-bit floating-point
real number
D
+2
D
D
+1
D
+3
64-bit floating-point
real number
D
+2
D
D
+1
D
+3
64-bit floating-point
real number
S
+2
S
S
+1
S
+3
64-bit floating-point
real number
D
+2
D
D
+1
D