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Reverse PID mode in Modicon M241/M251

There is no input to select between direct/inverse direction at the PID function block from the Util library.
The FB_PID function block (Toolbox library) is from Schneider and has additional features.
With FB_PID function block from the Toolbox library in SoMachine to change the regulation direction user can use negative P-factor (i_rKp)
The basic PID function must remain the same.
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