Controlling Sfc Programs By Instructions (Sfc Control Instructions) - Mitsubishi MELSEC-Q Series Programming Manual

4 SFC PROGRAM CONFIGURATION
4.4 Controlling SFC Programs by Instructions (SFC Control
Instructions)
SFC control instructions can be used to check a block or step operation status (active/inactive), or
to execute a forced START or END, etc.
An normal SFC program can be controlled by SFC control instructions in a sequence program and
SFC program. (A program execution management SFC program cannot be controlled by using
SFC control instructions.)
The types and functions of the SFC control instructions will be explained.
Name
LD, AND, OR,
Step operation
LDI, ANI, ORI
status check
LD, AND, OR,
instruction 0
LDI, ANI, ORI
LD, AND, OR,
LDI, ANI, ORI
Forced transition
LD, AND, OR,
check instruction
LDI, ANI, ORI
Block operation
LD, AND, OR,
status check
LDI, ANI, ORI
instruction
MOV(P)
MOV(P)
Active steps
DMOV(P)
batch readout
DMOV(P)
instruction
BMOV(P)
BMOV(P)
Block START
SET
instruction
Block END
RST
instruction
Block STOP
PAUSE
instruction
Block restart
RSTART
instruction
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Ladder Expression
Sn 1 • Checks a specified step in a specified
BLm/Sn
TRn 1
BLn\TRn
BLm
K4Sn D 1
BLm\K4Sn D
K8Sn D 1
BLm\K8Sn D
D
K4Sn Kn 1
BLm\K4Sn D Kn
BLm
BLm
BLm
BLm
Function
block to determine if the step is active or
inactive.
• Checks a specified step in a specified
block to determine if the transition
condition (by transition control
instruction) for that step was satisfied
forcibly or not.
• Checks a specified block to determine if
it is active or inactive.
• Active steps in a specified block are read
to a specified device as bit information.
• A specified block is forcibly started
(activated) independently and is
executed from an initial step.
• A specified block is forcibly ended
(deactivated).
• A specified block is temporarily stopped.
• The temporary stop status at a specified
block is canceled, with operation
resuming from the STOP step.
CPU Module Type
High
Performance
Universal
Basic Model QCPU,
model
model Process CPU,
QCPU,
QCPU Redundant
LCPU
CPU,
QnACPU
: Usable, : Unusable
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