241
Sequence Control Instructions Section 3-5
Flags
Precautions 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)
Note 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.
Example In the following example, the looped program section transfers the content of
D00100 to the address indicated in D00200 and then increments the content
of D00200 by 1.
3-5-10 BREAK LOOP: BREAK(514)
Purpose 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.
Ladder Symbol
Variations
Name Label Operation
Error Flag ER ON if more than 15 loops are nested.
OFF in all other cases.
Equals Flag = OFF
Negative Flag N OFF
#0000
D00200
@D00200
D00100
&3
Repeated 3 times.
BREAK(514)
Variations Executed Each Cycle for ON Condition BREAK(514)
Executed Once for Upward Differentiation Not supported
Executed Once for Downward Differentiation Not supported
Immediate Refreshing Specification Not supported
To Next Page
Need help?
General
