Omron FQM1-MMP21 User Manual

A subroutine is a program written between the SBN(092) and RET(093) instructions in a special subroutine
area. A subroutine is called from the main program using the SBS(091), MCRO(099), or JSB(982) instruction. 

Subroutines can be used in the following three ways with the FQM1.

A normal subroutine is written between the SBN(092) and RET(093) instructions and called using the
SBS(091) instruction.

1.

Write the program to be executed between SBN(092) and RET(093).

2.

Set the subroutine number for the operand of SBN(092).

3.

Call the subroutine using SBS(091)

Normal subroutines

Normal subroutines are executed without passing parameters.

SBS(091)

Subroutines for 
which parameters 
are passed

• Parameters can be passed to the subroutine.
• The results of processing in the subroutine can be returned to the 

main program. 

MCRO(099)

• Flags can be used to access the input condition to the subroutine 

while the subroutine is being executed.

• It’s possible to check to see if a subroutine has been executed in the 

past.

• Parameters can be passed to and from the subroutine using storage 

registers. 

JSB(982)

SBN

100

RET

SBS

100 

SBN

10

RET

Set the subroutine 
number to call. Here, 
the subroutine number 
is 100.

Main program 
(section 1)

Subroutine 
(section 2)

Set the the subroutine 
number. Here, the 
subroutine number is 
100.

Subroutine 
(section 3)

Set the the subroutine 
number. Here, the 
subroutine number is 
10.

Processing

Processing