Safety Programming Guideline
Entry ID: 109750255, V1.0, 10/2017
3.8 Accessing global data
Recommendation
Connect global data (inputs, outputs, data blocks) at the highest block
hierarchy level (Main Safety).
Use the block interfaces to pass signals to lower levels.
Advantages
Modular block concept
Reuse of program parts in other projects without modifications
Reduces programming errors
Makes the overall program easier readable as the general function of a block
can already be estimated from the interfaces.
Figure 3-9: Connecting global data
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