ABB AC500 Introduction Manual page 95

In order to set this value permanently, the Force function has to be used. With this function, the user
defined value is set in the runtime system each time at the beginning and at the end of the program
cycle.
This way, the input is assigned to the output (i.e. set to TRUE) in each program cycle. The CoDeSys
software displays the TRUE state in blue color (the FALSE state is displayed in black).
This way, the input I0dig is assigned to output O0dig.
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Introduction to AC500 1-93
AC500 / Issued: 07.2006