Omron CP - PROGRAMMING MANUAL 05-2007 - Page 1040

1007
Block Programming Instructions Section 3-30
Conditional block branching can be used within a loop, but the entire branch
operation must be within the loop.
Correct: Incorrect:
LOOP(809) LOOP(809)
IF(802) IF(802)
IF(802) IF(802)
IEND(804) IEND(804)
IEND(804) LEND(810)
LEND(810) IEND(804)
NOP processing will be performed if LOOP(809) is not executed.
An error will occur and the Error Flag will turn ON if a Loop Control Instruction
is not in a block program.
Examples When CIO 0.00 is ON in the following example, the block program is exe-
cuted. After “A” is executed, “B” and the IORF(184) after it will be executed
repeatedly until CIO 0.01 is ON, at which time C will be executed and the
block program will end.
Address Instruction Operand
000220 LD 0.00
000201 BPRG 0
.
.
A.
.
000210 LOOP ---
.
.
B.
.
000220 IORF .
.
0000
0000
000221 LEND 0.01
.
.
C.
.
000220 BEND ---
0
0.00
0.01
Execution
condition
ON
Execution
condition
OFF
Execution
condition
OFF
Repeating