The Number of Writes metric is used to get information about which variables are written.
Each writing of a variable in an implementation is considered, but if the same variable is written twice in an implementation, it is only counted once.
Example
Number Of Write calculation example for IEC-61131-3 code:
iMyVariable := 1;
// Some other implementation
iMyVariable := 2;
Number Of Writes Result (for variable iMyVariable)
Number Of Writes = 1