Omron CP - PROGRAMMING MANUAL 05-2007 Programming Manual page 199

Sequence Control Instructions
Flags
Precautions
Note
Example
&3
D100
@D200
D200
3-4-10 BREAK LOOP: BREAK(514)
Purpose
Ladder Symbol
166
2. JME(005)-JMP(004) Loop
Program a loop with JME(005) before JMP(004). The instructions between
JME(005) and JMP(004) will be executed repeatedly as long as the execu-
tion condition for JMP(004) is OFF. (A Cycle Time Too Long error will occur
if the execution condition is not turned ON or END(001) is not executed
within the maximum cycle time.)
Name Label
Error Flag ER
Equals Flag =
Negative Flag N
Program FOR(512) and NEXT(513) in the same task. Execution will not be
repeated if these instructions are not in the same task.
A jump instruction such as JMP(004) may be executed within a FOR-NEXT
loop, but do not jump beyond the FOR-NEXT loop.
The following instructions cannot be used within FOR-NEXT loops:
• Block programming instructions
• MULTIPLE JUMP and JUMP END: JMP(515) and JME(516)
• STEP DEFINE and STEP START: STEP(008)/SNXT(009)
If a loop repeats in one cycle and a differentiated bit is used in the FOR-NEXT
loop, that bit will be always ON or always OFF within that loop.
In the following example, the looped program section transfers the content of
D100 to the address indicated in D200 and then increments the content of
D200 by 1.
Repeated 3 times.
Programmed in a FOR-NEXT loop to cancel the execution of the loop for a
given execution condition. The remaining instructions in the loop are pro-
cessed as NOP(000) instructions.
BREAK(514)
Operation
ON if more than 15 loops are nested.
OFF in all other cases.
OFF
OFF
D100
#0000
D200
Section 3-4
D0
D1
D2