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

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.
Using the SFC control instructions with an SFC program created with SFC program symbols, the SFC program can be usually
controlled easily.
(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 Instruction Expression
Step operation a,&a,|a,
status check b,&b,|b
instruction 0
a,&a,|a,
b,&b,|b
Forced transition a,&a,|a,
check instruction b,&b,|b
a,&a,|a,
b,&b,|b
Block operation a,&a,|a,
status check b,&b,|b
instruction
Active steps batch MOV(P) K4Sn (d)
readout instruction
MOV(P) BLm\K4Sn (d)
DMOV(P) K8Sn (d)
DMOV(P) BLm\K8Sn (d)
BMOV(P) K4Sn (d) Kn
BMOV(P) BLm\K4Sn (d) Kn
Block START sBLm
instruction
Block END rBLm
instruction
Block STOP PAUSE BLm
instruction
Block restart RSTART BLm
instruction
Step START sSn
instruction
sBLm\Sn
4 SFC PROGRAM CONFIGURATION
72

4.4 Controlling SFC Programs by Instructions (SFC Control Instructions)

*1
Sn
BLm\Sn
*1
TRn
BLm\TRn
BLm
*1
*1
*1
*1
Function
Checks a specified step in a
specified 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.
A specified block is forcibly started
(activated) independently and is
executed from a specified step.
CPU Module Type
Basic High
model Performance
QCPU Model QCPU,
Process CPU,
Redundant
CPU
 
 
 
 
 
 
 
 
 
Universal
model
QCPU,
LCPU








