Mitsubishi QCPU (Q Mode) User Manual

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MELSEC-Q
4 SEQUENCE PROGRAM CONFIGURATION AND EXECUTION
CONDITIONS
4.2.4 Stand-by type program
(1) Definition of stand-by type program
(a) Stand-by type programs are executed only when requested.
(b) Stand-by type programs are used for the following applications.
1) Placing programs in the library
Sub-routine and interrupt programs are converted to stand-by type
programs which are managed separately from the main program.
2) Changing the program setup
Main routing programs registered as stand-by type programs can
execute the programs required for control by converting them to scan
execution type programs.
They will be reconverted to stand-type programs after they completes
the program execution.
(2) Stand-by type program applications
(a) Placing programs in the library
1) This application is used to manage sub-routine and interrupt programs
separately from the main routine program.
Multiple sub-routine and interrupt programs can be created for a single
stand-by type program.
Scan execution type program
Main routine
program
Sub-routine
program
Interrupt
program
P100
I0
Stand-by type program
Scan execution type program
Main routine
program
Sub-routine
program
Interrupt
program
P100
I0
2) When stand-by type program execution is completed, the program,
which was active before the stand-by type program was executed, is
executed.
A stand-by type program's sub-routine and interrupt programs are
executed as shown below.
Scan execution type program
Sub-routine program
Interrupt program
P100
RET
I0
IRET
END processing
CALL P100 command execution
END processing
Interrupt error factor occurred.
END processing

Mitsubishi QCPU (Q Mode) Specifications

General

Brand	Mitsubishi
Model	QCPU (Q Mode)
Category	Controller
Language	English