ABB PM645B 3BSE010535R1 Module Brand New And Original
Control Modules
Control module solutions may be more efficient than function block solutions, particularly if complex applications with deep hierarchical structures are to be used. This is in particularly true for parameters of structured type, which are distributed as In and/or Out parameters. Function block parameters are copied at each call, while control module parameters are set up once during compilation.
Suppose we have the same code in a function block and in a control module, and that the blocks do not have any parameters. In this case, the function block will execute faster than the control module, since control modules have an extra overhead of 4-5 microseconds for each code block (in PM860), function blocks do not have this overhead. The memory requirement will be the same for both.
Function block parameters are copied at each call, which means that the CPU will spend considerable time passing parameter values to and from function blocks, if there are deep structures in the program. The parameter connections of a control module, on the other hand, are defined prior to compilation. This gives superior performance using control modules when parameters are transferred through deep hierarchies.
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