Omron SYSMAC C2000H Operation Manual page 212

Step Instructions
Example 3:
Parallel Execution
Process C
SW2
206
The following process requires that two parts of a product pass simultane-
ously through two processes each before they are joined together in a fifth
process. Various sensors are positioned to signal when processes are to
start and end.
SW1 SW3
Process A
Process D
SW4
The following diagram demonstrates the flow of processing and the switches
that are used for execution control. Here, process A and process C are
started together. When process A finishes, process B starts; when process C
finishes, process D starts. When both processes B and D have finished,
process E starts.
Process A
Process B
Process E
End
The program for this operation, shown below, starts with two SNXT(09) in-
structions that start processes A and C. These instructions branch from the
same instruction line and are always executed together, starting steps for
both A and C. When the steps for both A and C have finished, the steps for
process B and D begin immediately.
When both process B and process D have finished (i.e., when SW5 and SW6
turn ON), processes B and D are reset together by the SNXT(09) at the end
of the programming for process B. Although there is no SNXT(09) at the end
of process D, the control bit for it is turned OFF by executing SNXT(09) LR
0004. This is because the OUT for LR 0003 is in the step reset by SNXT(09)
LR 0004, i.e., LR 003 is turned OFF when SNXT(09) LR 0004 is executed
SW5
Process B
SW6
SW 1 and SW2 both ON
Process C
SW3
Process D
SW5 and SW6 both ON
SW7
Section 5-22
SW7
Process E
SW4