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4 SFC PROGRAM CONFIGURATION
MELSEC-Q
: First five digits of serial No. are 04122 or later.
High Performance
Basic
QCPU
PLC CPU
Process
CPU
Applicable
CPU
Redundant
CPU
Universal
4.4.8 Step START and END instructions (s, r)
Usable Devices Programs Using Instructions Execution Site
Internal Device
(System, User)
Link Direct
J
\
SFC Program
Bit Word
File
Register
R
Bit Word
Intelligent
Function
Module
U
\G
Index
Z
Constant
K, H
Expansion
SFC
BLm\Sn
Other
Sn
Data
Type
Sequence
Program
Step
Transition
Condition
Block Step
Transition
Condition
D
Device
name
: Only step relay (S) can be used
n is a step No.
s
D
n is a step No.
r
D
m is a block No.
s
D
m is a block No.
r
D
(BLm\Sn)
(Sn) (Sn)
(BLm\Sn)
[Function]
(1) Step START instruction (s)
(a) A specified step at a specified block is activated forcibly. Operation at the block in question
varies as follows, depending on whether the block is active or inactive.
1) When the specified block is inactive:
The specified block is activated when the instruction is executed, and processing starts
from the specified step.
Processing is performed as shown below when step 1 in block 1 is started in the
sequence program.
S0
S2
S1
Block 1: Inactive Block 1: Inactive to active
When step 1 (S1)
is started
S0
S2
S1
Inactive
Inactive
Inactive
Inactive to active (processing starts from S1)
When the block START/END bit of the SFC information devices has been set, the
corresponding bit device changes from OFF to ON.
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