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CHAPTER 2 APPLICATION OF PROGRAMMING

2.8 Executing Multiple Programs

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.

• 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.

P100

Scan execution type program

Main routine

program

Subroutine

program

Interrupt

program

Scan execution type program

Main routine

program

Standby type program

Subroutine

program

Interrupt

program

Mitsubishi L02CPU User Manual

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