Mitsubishi Electric MELSEC iQ-R Series Programming Manual page 134

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Start condition setting
Set whether to automatically start and activate block 0 or to keep it inactive until a start request is issued, when starting the
SFC program.
[CPU parameter][SFC Setting][Start Conditions Setting]
Window
Displayed items
Setting
Auto-start block 0
(default)
Do not auto-start block 0
Use the start condition setting when it is desired to specify the start block at the start of SFC program according to the product
type.
"Auto-start block 0" is useful when block 0 is used as described below.
• Management block
• Preprocessing block
• Continuous monitoring block
■ Precautions
• To execute the SFC program when "Do not auto-start block 0" is set, execute the SET instruction (Starting a block) from the
sequence program or turn on the block START/END bit that is set in the SFC information device.
• When "Auto-start block 0" is set, be sure to create block 0.
Output mode setting at block stop
Set whether to turn off the coil output or to hold it when stopping a block.
[CPU parameter][SFC Setting][Output Mode Setting at Block Stop]
Window
Displayed items
Setting
Turn OFF
(default)
Keep ON
• The settings made are reflected to the initial value of SM325 (Output mode at block stop) at power-on, reset, or switching
from STOP to RUN, and follow the settings of SM325 when the SFC program operates. CPU parameter settings are
ignored.
8 SFC PROGRAM
132
8.5 SFC Setting
Description
At SFC Program START
Block 0 is started automatically and starts execution from its
initial step.
Block 0 is activated by a start request resulting from the SET
(Starting a block) instruction or a block start step, in the same
manner as other blocks.
Description
Coil output is turned off.
Coil output is held in the state immediately before stop.
At the end of block 0
Block 0 is restarted automatically and restarts execution from
its initial step.
Block 0 is not restarted automatically and remains inactive
until another start request is issued.

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