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6 SFC PROGRAM EXECUTION
MELSEC-Q
6.4 Step START (Activate) and END (Deactivate) Methods
6.4.1 Step START (activate) methods
There are the following step START (activation) methods.
Step START
(Activation) Method
Operation Remarks
Step START by SFC
diagram symbol
• The corresponding step is automatically started when
the preceding transition condition is satisfied.
Started when condition is satisfied.
Transition condition
• Basic operation of SFC program
Step START by SFC
control instruction
• The specified step is forcibly started by the SFC
control instruction at the step (operation output) of the
SFC program or in another sequence program.
Condition
n is the step No.
sSn
Condition
m is the block No., n is the step No.
sBLm\Sn
• Jump to other blocks can be made.
• When the block of the destination step is
inactive, a block forced START is made
from the specified step.
• When there are initial steps in multiple
blocks, a selection START is made.
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