IAI America SSEL - Manual (Page 221)

199
Part 2 Programs
1.14 Structural DO
z DW (DO WHILE)
Command, declaration
Extension condition
(LD, A, O, AB, OB)
Input condition
(I/O, flag)
Command,
declaration
Operand 1 Operand 2
Output
(Output, flag)
Optional Optional DW
Variable
number
Data CP
[Function] Compare the content of the variable specified in operand 1 with the value specified in
operand 2, and execute the subsequent commands up to EDDO while the condition is
satisfied.
The program will proceed to the step next to the corresponding EDDO if the condition is no
longer satisfied.
A LEAV command can be used to forcibly end a loop.
If the input condition is not satisfied and the DW
command is not executed, the program
will proceed to the step next to the corresponding EDDO.
A maximum of 15 nests are supported when IF
and IS are combined.
DW
EQ Operand 1 = Operand 2
NE Operand 1 z Operand 2
GT Operand 1 > Operand 2
GE Operand 1 t Operand 2
LT Operand 1 < Operand 2
LE Operand 1 d Operand 2
[Example 1] 008 DWEQ 1 0 Repeat the command up to an EDDO command while
variable 1 contains “0.”
:
:
EDDO
If DW is specified at the start and input 8 is OFF, nothing will occur and the program
will proceed to the step next to EDDO.
(Note) Using a GOTO command to branch out of or into a DW
-EDDO syntax is prohibited.
z LEAV (Pull out of DO WHILE)
Command, declaration
Extension condition
(LD, A, O, AB, OB)
Input condition
(I/O, flag)
Command,
declaration
Operand 1 Operand 2
Output
(Output, flag)
Optional Optional LEAV Prohibited Prohibited CP
[Function] Pull out of a DO loop and proceed to the step next to EDDO.
[Example 1] DWEQ 1 0 Repeat the commands up to an EDDO command while
variable 1 contains ‘0.”
:
600 LEAV Forcibly end the loop if flag 600 is ON and proceed to
the step next to an EDDO command.
:
EDDO