Omron FQM1-MMA21 User Manual

Responding 
quickly to exter-
nal signals and 
operate

Executing pro-
cessing as soon 
as change in 
external input 
signal detected

Starting inter-
rupt processing 
when an input 
bit turns ON 
and/or OFF. 

• Input function 

settings

• Interrupt inputs 

(MSKS(690) 
instructions)

Set input function to Interrupt inputs.

Executes interrupt tasks when Motion Control 
Module built-in input bits (input No. 0.00 to 0.03) 
turn ON and/or OFF.

Executing pro-
cessing after set 
amount of exter-
nal signal 
changes 
counted

Starting inter-
rupt processing 
once the speci-
fied number of 
input bit rising 
edges, falling 
edges, or both 
have been 
counted

• Input function 

settings

• Counting inter-

rupts in 
counter mode 
(MSKS(690) 
instruction)

Set input function to Interrupt input and counter 
mode using MSKS(690) instructions.

Decrements the PV each time the Motion Con-
trol Module built-in input bit (input numbers 
0000.00 to 0000.03) turns ON and/or OFF and 
executes interrupt tasks when the PV reaches 0.

Repeating pro-
cesses each 
time specified 
period passes

Starting inter-
rupt processing 
at scheduled 
time

• Interval  timer 

interrupt 
(scheduled 
interrupt: 
STIM(980) 
instruction)

Repeats interrupt task execution at scheduled 
intervals.

Can be used within interrupt tasks because spe-
cial timer used.

Executing pro-
cessing once 
specified timer 
interval passes 
after startup sig-
nal input

Starting inter-
rupt processing 
once only, after 
specified inter-
val has elapsed

• Interval  timer 

interrupt (one-
shot interrupt: 
STIM(980) 
instruction)

Executes interrupt task once only after specified 
period elapses.

Can be used within interrupt tasks because spe-
cial timer used.

Starting inter-
rupt processing 
once periods of 
any set time 
have elapsed 
from timer start

• Pulse output
• Target value 

comparison 
interrupt 
(CTBL(882) 
instruction)

Executes specified interrupt task when target 
value in registered table matches the pulse out-
put counter PV.

Starting pro-
cessing when 
high-speed 
counter PV 
reaches set 
value

Starting inter-
rupt processing 
when high-
speed counter 
PV reaches 
specified value

• High-speed 

counter target 
value compari-
son interrupt 
(CTBL(882) 
instruction)

Executes specified interrupt task when target 
value in registered table matches high-speed 
counter PV.