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ifm System Manual ecomatmobile BasicDisplay (CR0451) V01
Limitations and programming notes Programming notes for CoDeSys projects
6.2.2 Operating sequence
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In principle, there are two options to create a PDM project:
A) First the visualisation, then the PLC program.
Advantages:
In the program it is possible to cross-reference
to the finished images.
When the PLC program is tested the images
already exist
Disadvantage:
The PLC parameters and variables required in
the images have not yet been defined.
B) First the PLC program, then the visualisation.
Advantage:
All parameters and variables are defined in the
PLC program before they are referred to in the
visualisations.
Disadvantages:
The parameters from the images (image
number, key, LED, etc.) must be found
elsewhere.
The PLC program can only be tested after
creation of the visualisation.
In both cases we urgently recommend to design a precise structure of the visualisation and its
contents before starting.
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