Siemens SINUMERIK 840D sl Operating Manual page 207

The commissioning engineer sees a complete step tree during project execution. The use of
subprojects is no longer visible here.
Due to the linking in step trees, the commissioning of modular machines is supported even
more efficiently.
Example
In the following example, the position of a project as the main or subproject is explained and
the possible linking depth is shown.
In principle, any project that can run can function as a main project or subproject (an error-free
step tree is sufficient in the subproject). A project is designated as a subproject if it serves as
a source of the step linking for another project. The main project is thus the project that contains
step links from one or more (sub-)projects.
Green connecting line
Red struck-through connecting line
The position of the projects as main project or subproject
Project 1 is the main project and can only run with Project 2 (here: subproject). The prerequisite
is that the link to Project 3 shown in red does not exist.
Project 2 is both the main project and the subproject. From the perspective of Project 1, it is
the subproject. As the main project, it can run independently with Project 3 (subproject here).
In this example, Project 3 is the subproject, but it can also run independently (corresponding
to a main project).
Rules
To link steps from one project to another project, one project is defined as the main project
(MP) and at least one project is defined as the subproject (SP).
The projects remain independent and no project properties are changed. Each project can
thus be used as a main project or a subproject.
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Permissible step logic operations from:
● subproject Project 2 to main project Project 1 and
● subproject Project 3 to main project Project 2.
Impermissible step logic operation:
Step [2] of the subproject Project 2 is already used in the main project
Project 1. (Linking depth = 1).
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4.4 Project folder
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