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4 SFC PROGRAM CONFIGURATION
MELSEC-Q
4.7.2 Block 0 START condition
The block 0 START condition is designed to set whether block 0 will be automatically activated or
not at SFC program START (when SM321 turns from OFF to ON).
Use the block 0 START condition when it is desired to specify the START block at SFC program
START according to the product type, etc.
"Auto START ON" is useful when block 0 is used as described below.
• Used as a control block
• Used as a preprocessing block
• Used as an always watched block
(1) Settings and corresponding operations
Set block 0 to "Auto START ON" or "Auto START OFF".
At SFC program START and END step execution, operations are performed as described
below.
Operation
Setting
At SFC Program START At end step execution in block 0
Autostart block 0
(default)
• Block 0 is automatically activated, and is
executed from its initial step.
• When the end step is reached, the initial step
is automatically activated again.
Do not autostart block 0
• Block 0 is activated by a START request
resulting from an SFC control “block START”
instruction or a block START step, in the same
manner as other blocks.
• When the end step is reached, block 0 is
deactivated and waits for another START
request to be issued again.
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