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The following process requires that two parts of a product pass simultaneously
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.
Process C
SW1
SW2
Process A
SW3
SW4
Process D
Process B
Process E
SW6
SW5
SW7
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 E
End
Process C
SW7
Process B
Process D
SW3
SW4
SW 1 and SW2 both ON
SW5 and SW6 both ON
The program for this operation, shown below, starts with two SNXT(09) instruc-
tions that start processes A and C. These instructions branch from the same in-
struction 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 the status for both
of them is “ON”, but SW5 and SW6 have turned 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 Process B is thus reset directly and process D is
reset indirectly before executing the step for process E.
Example 3:
Parallel Execution
Step Instructions
Section 5-24
Содержание SYSMAC C200HS
Страница 1: ...Cat No W235 E1 05 C200HS SYSMAC Programmable Controllers...
Страница 2: ...C200HS Programmable Controllers Operation Manual Revised February 2002...
Страница 3: ...iv...
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Страница 379: ...371 SR word Corresponding key s Bit 279 03 04 05 3 06 07 VER 08 09 Monitoring Operation and Modifying Data Section 7 1...
Страница 470: ...468 Programmer Program Date Page Word Contents Notes Word Contents Notes Data Storage...
Страница 471: ...469 Programmer Program Date Page TC address T or C Set value Notes TC address T or C Set value Notes Timers and Counters...