Sfc Information Devices - Mitsubishi Electric MELSEC iQ-R Series Programming Manual

8.4

SFC Information Devices

SFC information device is the device or label which operates the forced start/termination and pause/restart direction to a
block, check of the status of transition and the number of active steps, or direction of continuous transition operation of a
transition.
SFC information device is set every blocks.
[Navigation window]  [Program]  SFC program fileproperties of block to be set
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Displayed items
Item Description
Block START/END Bit Sets the device or label to check whether the block is active.
Setting the bit to on can start the block and setting it to off can end the block.
Step Transition Bit Sets the device or label to check whether the transition of the step being executed
becomes TRUE.
This bit turns on when the transition to the next step becomes TRUE after
execution of the action of each step.
Block PAUSE/RESTART Sets the device or label to pause or restart an active block.
Bit Setting the bit to on stops the block at the step in execution and setting it to off
restarts executing the block from the step where the block was stopped previously.
Block Stop Mode Bit Sets the device or label that decides the timing for stopping a block.
Setting the bit to on stops the block after transition of each step and setting it to off
stops all steps immediately.
Continuous Transition Bit Sets the device or label that decides the continuous transition action when the
transition becomes TRUE.
Setting the bit to on enables continuous transition and accordingly the action of the
next step is executed in the same scan. Setting the bit to OFF disables continuous
transition and accordingly one step is executed every scan.
Number of Active Steps Sets the device or label in which the number of currently active steps of a block is
Register to be stored.
Not only global devices and local devices but also global labels or local labels can be specified for SFC information devices.
Indirect specification, digit specification, and index modification (Z, LZ) cannot be performed.
The settings of SFC information device are required only when an SFC information device is used. If such
device is not used, the settings of SFC information device are not required.
Available data
Device Data type (label)
Bit: Y, M, L, F, V, B Bool, Boolean array,
Word: Bit INT bit specification,
specification of D, W, Word bit
RD specification
D, W, R, ZR, RD INT, WORD
8 SFC PROGRAM
8.4 SFC Information Devices
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