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LOOP
LOOP (Loop to Label) instruction skips to the LBL (see page 1013) instruction with the same
Description
number Num* as the LOOP instruction and repeats execution of what follows until the data of a
specified operand becomes "0".
To add an enable input and enable output to the instruction, select [With EN/ENO] from the
"Instructions" pane (LD, FBD or IL editor). To reuse an instruction select "Recently used" from the
context menu or press <Ctrl>+<Shift>+<v> in the programming window.
The LBL instructions are specified as destination of the LOOP instruction. It is not possible to
specify two or more LBL instructions with the same number Num* within a program. If the set
value s in the data area is "0" from the beginning, the LOOP instruction is not executed (ignored).
It is not possible to use this function in a function block POU.
The maximum possible value that can be assigned to Num* depends
on the PLC type.
Availability of LOOP (see page 1328)
PLC types
Data types
Variable
Data type
INT, WORD
s
constant
Num*
Operands
For
s
In this example the function is programmed in ladder diagram (LD).
Example
Loop to label
Function
Set value
Constant number that must correspond to LBL number, this
"nested" program is looped until the variable at s reaches 0
Relay
WX
WY
WR
WL
Program execution control instructions
T/C
Register
SV
EV
DT
LD
FL
Constant
-
1013
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