Block - Mitsubishi Electric MELSEC iQ-R Series Programming Manual

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Block

A block is a unit showing a series of operation consisting of steps and transitions.
Block0
Up to 320 blocks can be created in an SFC program.
A block begins with an initial step, a step and a transition are connected alternately, and ends with an end step or jump
sequence.
A block has an either state of active or inactive.
• Active: The block has an active step.
• Inactive: All steps in the block are inactive.
When the block state changes from inactive to active, the initial step becomes active to start sequential processing. (
Page 138 Block execution sequence)
• Setting CPU parameters enables only block 0 to be started automatically when the SFC program starts. In
this case, when the end step is activated and the block 0 is finished, the block 0 is automatically restarted
and execution of steps is started again from the initial step. ( Page 132 Start condition setting)
• If a start request is issued to a step in an inactive block by using the SET instruction (activating a step), the
block is activated to execute processing from the specified step.
8 SFC PROGRAM
92
8.2 Structure
Block1
Block2

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