Mitsubishi Electronics QCPU Welding System User Manual


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ED+(P),ED-(P)
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6.2 Arithmetic Operation Instructions
6.2.10 Addition and subtraction of floating decimal point data (Double precision) (ED+(P),ED-(P))
ED-
(1) Subtracts a 64-bit floating decimal point type real number designated by and a 64-bit
floating decimal point type real number designated by , and stores the result at a device
designated by .
(2) Values which can be designated at and and which can be stored, are as follows:
0, 2
-1022
| Designated value (stored value) | < 2
1024
Operation Error
(1) In any of the following cases, an operation error occurs, the error flag (SM0) turns ON, and
an error code is stored into SD0.
The contents of the designated device or the result of the addition are not "0", or not within
the following range: (Error code: 4140)
0, 2
-1022
| Contents of designated device | < 2
1024
The value of the designated device is 0. (Error code: 4140)
The result of addition/subtraction exceeds the following range (Operation results in an
overflow):
2
1024
| Result of operation | (Error code: 4141)
Program Example
(1) The following program adds the 64-bit floating decimal point type real numbers at D3 to D6
and the 64-bit floating decimal point type real numbers at D10 to D13 when X20 goes ON,
and stores the result at D3 to D6.
[Ladder Mode] [List Mode]
[Operation]
(2) The following program subtracts the 64-bit floating decimal point type real number at D10 to
D13 from the 64-bit floating decimal point type real numbers at D20 to D23, and stores the
result of the subtraction at D20 to D23.
[Ladder Mode] [List Mode]
[Operation]
D
S
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
S
D
Step
Instruction
Device
D4
5961.437
D3D6 D5
D11
12003.200
D10D13 D12
D4
17964.637
D3D6 D5
Step
Instruction
Device
D21
97365.203
D20D23 D22
D11
76059.797
D10D13 D12
D21
21305.406
D20D23 D22