Siemens SIMATIC S7-200

Sequencer
5.3 Sequencer control
Getting Started - Advanced
Training Documents, 09/2007, A5E01469795B
45
5.3 Sequencer control
:HZLOOQRZVROYHWKHGULOOH[DPSOHZLWKD
VHTXHQFHU
What is a sequencer control?
● A control method in which a task is broken down into very small, usually sequential,
subtasks (such as Motor on, feed on, or feed off).
● The subtasks (functions) are called steps.
● Usually one step has to be completed before the next one is started.
● A new step becomes active when the relevant transition condition is active.
● A step is active when the associated step flag, for example: M0.1 = "1".
6WHS
0
6WHS
0
6WHS
0
$VWHSLVGHILQHGIRU
HYHU\LPSRUWDQW
VWDWH
6WHSQXPEHUSURYLGHV
XQLTXHLGHQWLILHU
0RWRURQ
)HHGRQ
)HHGRII
6XEWDVNIXQFWLRQRIWKHVWHS
DFWLRQ
6WHSIODJ
(DFKVWHSLVDVVLJQHGDVHSDUDWH
PHPRU\ELWVWHSIODJ$VWHSLV
DFWLYDWHGZKHQWKHVWHSIODJLVDFWLYH
 
$Q\ELWPHPRU\0DGGUHVVFDQEH
XVHGIRUVWHSIODJV