![background image](http://html1.mh-extra.com/html/omron/sysmac-c1000h/sysmac-c1000h_operation-manual_743079207.webp)
201
Interlocks, jumps, SBN(92), and END(01) cannot be used within step pro-
grams.
Bits used as control bits must not be used anywhere else in the program un-
less they are being used to control the operation of the step (see example 3,
below).
If IR or LR bits are used for control bits, their status will be lost during any
power interruption. If it is necessary to maintain status to resume execution
at the same step, HR bits must be used.
25407:
Step Start Flag; turns ON for one cycle when STEP(08) is executed
and can be used to reset counters in steps as shown below if neces-
sary.
SNXT(09) 01000
CP
R
CNT 01
#0003
00000
00100
25407
STEP(08) 01000
1 Cycle
25407
01000
Start
Address
Instruction
Operands
Address
Instruction
Operands
00000
LD
00000
00001
SNXT(09)
01000
00002
STEP(08)
01000
00003
LD
00100
00004
LD
25407
00005
CNT
01
#
0003
The following three examples demonstrate the three types of execution con-
trol possible with step programming.
Example 1
demonstrates sequential
execution;
Example 2
, branching execution; and
Example 3
, parallel execu-
tion.
Precautions
Flags
Examples
Step Instructions
Section 5-22