10.4 SOP Evaluation
The source le is the text le containing the logic statements and I/O assignments performing
the desired operations of the drive. Evaluation of logic statements occurs in a top to bottom, left
to right manner as written in the source le. The only exception is the simple statements in which
the output variable, i.e. the ag, is set either true or false. These statements are evaluated once
only at the initialization of the SOP during power-up, or when a new SOP is either downloaded
or selected.
Once an output variable is set to either true or false, it is immediately available as an input to any
subsequent logic statements within the context of the logic tables. There is no limitation to how
many times an output variable may change logic states within the context of the program.
However, only the nal evaluation is output to any assigned output ags or external I/O.
Note
Reassignment of outputs is agged as a warning by the SOP Utilities compiler.
Note
The SOP evaluation cycle time is based on synchronization of the slow loop with the fault loop,
with worst case being two fault loop cycles or about 6.7 msec.
Operating the Software
10.4 SOP Evaluation
NXGPro+ Control Manual
434 Operating Manual, A5E50491925A
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