Omron FQM1-MMA21 Manuel D’Utilisation

Detecting speed 
using rotary 
encoder inputs

Detecting speed 
and use in out-
put control while 
managing posi-
tion using 
encoder inputs

Measuring dis-
placement of 
workpiece per 
unit time

Monitoring High-
speed Counter 
Movement 
(cycle time)

Outputs the change in the high-speed counter 
PV each cycle, while outputting number of input 
pulses as high-speed counter PV.

Used for applications such as detecting speed of 
external master axis during synchronous con-
trol.

Monitoring High-
speed Counter 
Movement 
(sampling time 
specified)

Outputs the change in the high-speed counter 
PV each sampling cycle (1 to 9,999 ms) speci-
fied asynchronously to Motion Control Module 
cycle.

Used for applications such as detecting external 
device speed or number of pulses within a spec-
ified time (not used for output control).

Monitoring 
speed while 
managing work-
piece position 
using encoder 
input

Measure input 
pulse cycle

Counter fre-
quency mea-
surement (pulse 
input 1 only)

Number of input pulses can be monitored simul-
taneously as high-speed counter PV and pulse 
frequency.

Measuring 
undulation, dis-
tortion, thick-
ness, height, or 
diameter, etc., of 
an object

High-speed 
tracing of analog 
data when 
external signal 
turns ON

Storing analog 
input value in 
memory at 
specified time 
(constant cycle)

• Interval  timer 

interrupts

• PRV(881) 

instruction

Can perform analog sampling at a constant 
cycle, using scheduled interrupt processing in 
analog input immediate refresh mode.

Sampling can be executed at small time inter-
vals using analog input conversion (40

µs).

Data stored in memory can also be displayed on 
PT and other display devices, e.g., to show 
trends.

High-speed 
tracing of analog 
data synchro-
nized with tar-
get object 
position

Storing analog 
inputs to DM 
Area synchro-
nous with posi-
tion (pulse input)

High-speed 
analog sam-
pling function

Sampling of target measurement object position 
as compared to the sampling based on time.

Interrupt tasks, as outlined above, are not used, 
so even more detailed sampling is possible.

Used for applications such as generating dis-
placement data for the measurement object 
from one position to another position.