Block Operation Status Check Instruction (A, B, &A, &B, |A, |B) [Blm] - Mitsubishi Electric MELSEC-Q Series Programming Manual

Block operation status check instruction (a, b, &a, &b, |a, |b)
[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
(s) 
Data Type
(s) Device name
Function
• Checks whether the specified block is active or inactive.
• The contact status changes as described below depending on whether the specified block is active or inactive.
Block Status
Active
Inactive
• The contact is always OFF if the block that does not exist in the SFC program is specified.
• As the "BLm" device is treated as a virtual device, the contact on the monitor of a peripheral device does not
turn ON/OFF. If the internal device is ON, the coil instruction is switched ON for operations.
• In the High-speed Universal model QCPU, the number of steps in the step activation check instruction
increases by one step from that in the QnUDE(H)CPU.
4 SFC PROGRAM CONFIGURATION
82
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
 
Contact of N/O Contact Instruction
ON
OFF
Process CPU

Intelligent
Function
Module
U\G
Word
Transition
Condition

LCPU
Redundant CPU
 
Index Z Constant Expansion
K, H SFC
 
Execution Site
Block Step
 
Contact of N/C Contact Instruction
OFF
ON
Other
BLm

Transition
Condition
