Omron SYSMAC CS Series Programming Manual page 78

Precautions
Subroutines
Instructions Not Available
in Subroutines
58
Place all the subroutines together just before the END(001) instruction in all
programs but after programming other than subroutines. (Therefore, a subrou-
tine cannot be placed in a step ladder, block program, FOR - NEXT, or JMP0 -
JME0 section.) If a program other than a subroutine program is placed after a
subroutine program (SBN to RET), that program will not be executed.
The following instructions cannot be placed in a subroutine.
Function
Process Step Control
Note Block Program Sections
A subroutine can include a block program section. If, however, the block pro-
gram is in WAIT status when execution returns from the subroutine to the
main program, the block program section will remain in WAIT status the next
time it is called.
Program
Subroutine
Program
Subroutine
Mnemonic
STEP(008)
SNXT(009)
Section 2-2
Instruction
Define step ladder section
Step through the step lad-
der