Mitsubishi Electric MELSEC FX3U Programming Manual page 820

FX /FX /FX Series Programmable Controllers
3G 3U 3UC
Programming Manual - Basic & Applied Instruction Edition
Composite flows with branches and recombination
The single flow format is the fundamental style in process transfer control. Only single flow is sufficient in
sequence control for simple operations. When various input conditions and operator manipulations intervene,
however, complicated conditions can be easily handled by using selective branches and parallel branches.
A branch for selectively processing many processes depending on a condition is called selective branch. A
branch for processing many processes at the same time is called parallel branch.
1. Selective branch
Either one among many flows is selected and executed.
2. Parallel branch
All of many flows are executed at the same time.
818
Branch state
relay
Recombination
state relay
Branch state
relay
Recombination
state relay
35 SFC Program and Step Ladder
35.1 SFC Program