Siemens SIMATIC S7-200

Sequencer
5.5 Structure of the sequencer program
Getting Started - Advanced
Training Documents, 09/2007, A5E01469795B
47
5.5 Structure of the sequencer program
The two program sections of a sequencer
control
1. The conditions for
activating the
individual steps (sub-
tasks) are logically
combined with the
individual step flags.
Start S1 I0.1,
3s delay,
depth limit I0.3,
initial position
I0.4
If flags M0.1... become
active in sequence,
the entire sequencer is
processed.
Step flags
M0.1,M0.2,
M0.3, M0.4
This defines the
overall sequence of
the sub-tasks.
2. The active memory
bits are assigned to
the outputs of the PLC
which then control
contactors or valves,
for example.
Q0.1, Q0.2, Q0.0
This is the interface to
the plant /machine.
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