371
Flags A50012:
The Step Flag is turned ON for one cycle when STEP(008) is executed and if
necessary it can be used to reset counters in steps as shown below.
(009)
SNXT 001000
(008)
STEP 001000
CNT 0001 #0003
0000
00
0001
00
A500
12
1 Cycle
A50012
01000
Start
00000 LD 000000
00001 SNXT(009) 001000
00002 STEP(008) 001000
00003 LD 000100
00004 LD A50012
00005 CNT 001
#0003
Address Instruction Operands
The following three examples demonstrate the three types of execution control
possible with step programming.
Example 1
demonstrates sequential execu-
tion;
Example 2
, branching execution; and
Example 3
, parallel execution.
The following process requires that three processes, loading, part installation,
and inspection/discharge, be executed in sequence with each process being re-
set before continuing on the the next process. Various sensors (SW1, SW2,
SW3, and SW4) are positioned to signal when processes are to start and end.
SW 1
SW 2
SW 3
SW 4
Loading Part installation Inspection/discharge
Examples
Example 1:
Sequential Execution
STEP DEFINE and STEP START: STEP(008)/SNXT(009) Section 5-29
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