Omron CJ - INSTRUCTIONS REFERENCE MANUAL 07-2009 Reference Manual page 735

3. Instructions
Function
GSBN
GSBN(751) indicates the beginning of the
global subroutine
subroutine number.
The region of the program beginning at the
first GSBN(751) instruction is the subroutine
region. A subroutine is executed only when it
has been called by GSBS(750).
GRET
GRET(752) indicates the end of a global
subroutine. When
reaches GRET(752) it is automatically
returned to the next instruction after the
GSBS(750) instruction that called the global
subroutine.
Precautions
• Always place the global subroutines in
interrupt task 0.
698
with the specified
program execution
Cyclic or interrupt task
GSBS
n
Interrupt task 0
GSBN
n
GRET
END
Not allowed
Cyclic task 1
GSBS
n
END
Cyclic task 2
GSBN
n
GRET
END
CS/CJ/NSJ Series Instructions Reference Manual (W474)
Global
subroutine
region
OK
Cyclic task 1
GSBS
n
END
Interrupt task 0
GSBN
n
GRET
END