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CHAPTER 2 APPLICATION OF PROGRAMMING
2
2.10 Settings When Program is Divided
2.10.3 Stand-by type program
2.10.3 Stand-by type program
Stand-by type program is executed only when its execution is requested. This type of program can be changed to any
desired execution type by a sequence program instruction.
(1) Application
(a) Program library
Stand-by 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 stand-by type
program.
(b) Program type change
Stand-by 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 stand-by ("Wait") type program in the PLC parameter
dialog box can be changed to a scan execution type program and executed in the sequence program.
(2) Execution method
Execute stand-by type programs in either of the following methods.
• Create subroutine and/or interrupt programs in a stand-by type program and call them using a pointer or
when an interrupt occurs.
• Change a stand-by type program to any other execution type using instructions.
P100
I0
P100
I0
Scan execution type program Scan execution type program
Stand-by type program
Main routine
program
Main routine
program
Subroutine
program
Interrupt
program
Subroutine
program
Interrupt
program
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