Active Step Change Instruction (Schg) - Mitsubishi Electric MELSEC-Q Series Programming Manual

Active step change instruction (SCHG)

QCPU
Programmable controller CPU
Basic High Performance
 
Usable Devices
Internal device File
(System, User) Register
R
Bit Word
(d) 
Data Type Programs Using Instructions
Sequence
Program
(d) BIN16 
Function
• Deactivates the step that executed an instruction, and forcibly activates the specified step (set with the device designated
by (d)) in the same block.
• When the destination step is already active, the step that executed the SCHG instruction is deactivated and the destination
step continues processing as-is.
• The step where this instruction is executed is deactivated when processing proceeds to the transition condition status
check following the completion of that step's program operation.
• This instruction can only be used at SFC program steps.
Operation Error
Error code Description
4631 When the specified destination step does not exist
4001 When this instruction is used at a sequence program other than an SFC program. An error is activated on switching from STOP to RUN.
Process CPU
Universal
 
Link Direct J\ Intelligent
Function
Module
U\G
Bit Word
SFC Program
Step Transition
Condition
 
4.4 Controlling SFC Programs by Instructions (SFC Control Instructions)
LCPU
Redundant CPU
 
Index Z Constant Expansion
SFC
 
Execution Site
Block Step
 
4 SFC PROGRAM CONFIGURATION
Other
4

Transition
Condition

101