Actions - Siemens SIMATIC S7-GRAPH Manual

Programming Actions and Conditions
7.1

Actions

In the steps, you program actions that, for example, control the inputs, outputs and
memory bits, activate or deactivate the steps of the sequencer or call blocks. This
means that actions contain instructions for process control. These actions are
executed in order from "top" to "bottom" when the step is active.
You program the step contents in the action table at the single page or single step
display level.
Components of an Action
An action consists of the following:
(1): An optional event (for example S1) and an instruction (for example N) and
(2): An address (for example M4.3) or an assignment (for example A:=B+C).
S4
Step4
Categories of Actions
Actions are divided into the following categories:
• Standard actions
With and without interlock
-
• Event-dependent actions
With and without interlock
-
To activate and deactivate steps
-
• Counters, timers and arithmetic in actions
Empty Steps (Steps Without Actions)
Steps that do not contain programmed actions are empty steps. An empty step
behaves like an active step. The following transition becomes valid.
7-2
Step is active
Step4
N
S0 R Q 4.4
Order of
S1 N
execution
1
S7-GRAPH for S7 300/400 Programming Sequential Control Systems
M 4.2
M 4.3
2
C79000-G7076-C526-01