Steps
Every SFC-scheme consists of elements representing steps and transition conditions. The following scheme describes steps:
The action is described in separate programming system window and is not shown on the chart. Only SFC step name tells about its purpose. Steps can be empty on the chart, that does not cause errors during project compiling. Empty steps are normal for top-down coding implementation which is typical for SFC. It is possible to define actions corresponding to step at any time. Empty steps remain in the complete project. The purpose of the empty step is transition pending. Every SFC-scheme begins with a step graphically marked by double vertical lines along the entire perimeter. This is the initial step. The initial step can be empty and should be represented by a single item.
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