Omron SYSMAC CVM1 Series Operation Manual page 376

STEP DEFINE and STEP START: STEP(008)/SNXT(009)
0000
00
Step controlled by 20200
00001
0
Step controlled by 20201
0000
02
Precautions
358
Two simple steps are shown below. In this example, the 1st step would be ex-
ecuted from the time that CIO 00000 goes ON until CIO 000001 goes ON. The
2nd step would be executed for the time the CIO 000001 goes ON until CIO
000002 goes ON. When CIO 000002 goes ON, step execution will be termi-
nated.
Control bits within one section of step programming must be sequential and from
the same word.
STEP(008) and SNXT(009) cannot be used inside of subroutines or block pro-
grams.
Only one step programming area can be executed during any one cycle.
Interlocks, jumps, SBN(150), and END(001) cannot be used within step pro-
grams.
You must use a differentiated execution condition for the SNXT(009) instruction
that starts step execution.
Bits used as control bits must not be used anywhere else in the program unless
they are being used to control the operation of the step (see example 3, below).
All control bits must be in the same word and must be consecutive.
Control bit status will be lost during any power interruption if it is not in the Hold-
ing Area. If it is necessary to maintain status to resume execution at the same
step, Holding Area bits must be used.
Only one section of step programming can be started during a cycle. Be sure that
two steps aren't started during a cycle.
Note Refer to page 101 for general precautions on operand data areas.
(009)
Starts step
SNXT 020200
execution
(008)
STEP 020200
1st step
(009)
SNXT 020201
(008)
STEP 020201
2nd step
(009)
SNXT 020202
(008)
STEP
Ends step
execution
Section 5-29
Address Instruction Operands
00000 LD 000000
00001 SNXT(009) 020200
00002 STEP(008) 020200
Step controlled by 20200.
00100 LD 000001
00101 SNXT(009) 020201
00102 STEP(008) 020201
Step controlled by 20201.
00200 LD 000002
00201 SNXT(009) 020202
00202 STEP(008) ---