1. The FB has an instance data block and the FC has no instance data block. This is the most essential difference.
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The background data block is a dedicated storage area for each controlled object, as if the controlled object is in the bank's personal safe. The temporary variable is a data area common to the controlled objects of multiple FBs and FCs. It is like a bulletin board. Everyone can post a message to the above, and the first posted notice will be overwritten by the post.
2. The local data of FB and FC have IN, OUT, IN_OUT and TEMP, and the return value of FC RET_VAL is actually the output parameter. So the presence or absence of a static variable (STAT) is the essential difference between the local variables of the two. FC has no static variables.
3. The output parameters of the function block are not only related to the input parameters from the outside, but also to the internal status data saved with the static variables. Function Because there are no static variables, the same input parameters produce the same result.
4. The initial value cannot be set for the local variable of the function. The initial value can be set for the local variable of the function block (excluding TEMP). The initial value requires a dedicated memory area to hold, and the FC cannot set the initial value because there is no background data block.
January 03, 2023