Eaton ELC-PB, Programming Manual

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4 . S e q u e n t i a l F u n c t i o n C h a r ts
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4.3 SFC Viewed as Ladder and Instruction List
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Rules of SFC
1. Segment and Row comments cannot be used in SFC mode – only Device comments can
be used.
2. Inner Ladder mode is used to develop ladder logic in SFC mode.
3. The device number of each step point (including the initial step point) must be unique.
4. Transition numbers are automatically assigned in sequential order.
5. A RET statement is generated in the Ladder logic of the last step of a procedure when the
SFC is compiled.
6. SFC code compiles into Instruction List which can then be viewed in Ladder. If a
change made in Ladder is to also be viewed in SFC, the Ladder must be compiled into
Instruction List and then from Instruction List into SFC. It is recommended to make
changes in Inner Ladder Mode.
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Graphical Examples
Example of the simultaneous divergence and simultaneous convergence procedures
SFC LADDER INSTRUCTION