Standby Type Program - Mitsubishi Electric L02SCPU User's Manual And Reference

2.8.3

Standby type program

Standby type program is executed only when its execution is requested. This type of program can be changed to any
desired execution type by a program instruction. This program is mainly used for the following purposes.
• Program library
Standby type program is used as a program library, a collection of subroutine programs and/or interrupt
programs, and managed separately from a main routine program. Multiple subroutine programs and/or
interrupt programs can be created and managed in a single standby type program.
Scan execution type program
P100
I0
• Program type change
Standby type program is used to create and store programs available in all systems. Only required programs
will be executed. For example, a program preset as a standby ("Wait") type program in the PLC Parameter
dialog box can be changed to a scan execution type program and executed in the program.
(1) Execution method
Execute standby type programs in either of the following methods.
• Create subroutine and interrupt programs in a standby type program and execute the standby program upon
interrupt or a call such as by a pointer.
• Change a standby type program to any other execution type using instructions.
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Main routine
program
Subroutine
program
Interrupt
program
Scan execution type program
Main routine
program
Standby type program
P100 Subroutine
program
Interrupt
I0
program