Block Start & End Instructions (S, R) [Blm] - Mitsubishi Electric MELSEC-Q Series Programming Manual

Block START & END instructions (s, r) [BLm]
QCPU
Programmable controller CPU
Basic
*1

*1 The serial number (first five digits) shall be 04122 or later.
Usable Devices
Internal device
(System, User)
Bit Word
(d) 
Data Type
(d) Device name
Function
■Block START instruction (sBLm)
• A specified block is forcibly activated independently and is executed from its initial step. When there are multiple initial
steps, all initial steps become active. When the bock START/END bit of the SFC information devices has been set, the
corresponding bit device changes from OFF to ON.
• If the specified block is already active when this instruction is executed, the instruction will be ignored (equivalent to the
NOP instruction), and processing will continue.
• While online change (inactive block) is executed to the specified block when this instruction is executed, the instruction will
be ignored (equivalent to the NOP instruction), and the online change processing will continue. (Universal model QCPU
whose serial number (first five digits) is "12052" or later, and the LCPU whose serial number (first five digits) is "15102" or
later only)
■Block END instruction (rBLm)
• A specified block is forcibly deactivated independently. When there are active steps, all are deactivated and the coil outputs
are turned OFF. When the bock START/END bit of the SFC information devices has been set, the corresponding bit device
changes from ON to OFF.
• If the specified block is already inactive when this instruction is executed, the instruction will be ignored (equivalent to the
NOP instruction) and processing will continue.
4 SFC PROGRAM CONFIGURATION
90
4.4 Controlling SFC Programs by Instructions (SFC Control Instructions)
High Performance Universal
 
File Link Direct J\
Register
R
Bit
Programs Using Instructions
Sequence SFC Program
Program
Step
 
Process CPU

Intelligent
Function
Module
U\G
Word
Transition
Condition

LCPU
Redundant CPU
 
Index Z Constant Expansion
K, H SFC
 
Execution Site
Block Step
 
Other
BLm

Transition
Condition
