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Sequence Control Instructions Section 3-5
Operand Specifications
Description The instructions between FOR(512) and NEXT(513) are executed N times
and then program execution continues with the instruction after NEXT(513).
The BREAK(514) instruction can be used to cancel the loop.
If N is set to 0, the instructions between FOR(512) and NEXT(513) are pro-
cessed as NOP(000) instructions.
Loops can be used to process tables of data with a minimum amount of pro-
gramming.
FOR-NEXT loops can be nested up to 15 levels. In the example below, pro-
gram sections A, B, and C are executed as follows:
A
→ B → B → C, A → B → B → C, and A → B → B → C
Area N
CIO Area CIO 0000 to CIO 6143
Work Area W000 to W511
Holding Bit Area H000 to H511
Auxiliary Bit Area A000 to A959
Timer Area T0000 to T4095
Counter Area C0000 to C4095
DM Area D00000 to D32767
EM Area without bank E00000 to E32767
EM Area with bank En_00000 to En_32767
(n = 0 to C)
Indirect DM/EM
addresses in binary
@ D00000 to @ D32767
@ E00000 to @ E32767
@ En_00000 to @ En_32767
(n = 0 to C)
Indirect DM/EM
addresses in BCD
*D00000 to *D32767
*E00000 to *E32767
*En_00000 to *En_32767
(n = 0 to C)
Constants #0000 to #FFFF (binary) or &0 to &65,535
Data Registers DR0 to DR15
Index Registers ---
Indirect addressing
using Index Registers
,IR0 to ,IR15
–2048 to +2047, IR0 to –2048 to +2047, IR15
DR0 to DR15, IR0 to IR15
,IR0+(++) to ,IR15+(++)
,–(– –) IR0 to, –(– –) IR15
Repeated N times
Repeated program section
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