For A(ns) Series PLC’s, SFC’s reside in the micro computer area of the memory cassette. This
area must be allocated from PLC Parameters / Memory, as shown below:
This is not the case for Q series, as the MELSEC System Q supports SFC’s in the program area.
Also for FX range, SFC’s actually compile to STL code in the program area.
One popular feature of SFC’s, is that in monitor mode, the current step is highlighted. This
means for fault finding purposes, engineers can see exactly how far the sequence has pro-
gressed and can investigate accordingly:
Complex Transitions Sequential Function Chart - SFC
14 - 8 MITSUBISHI ELECTRIC
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