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Analog Input Functions Section 7-9
The PRV(881) instruction can also be used to read the latest analog input
value through immediate refreshing. Analog signals can be input from pres-
sure sensors, position meters, or sensors that require high-speed input pro-
cessing such as a displacement sensors/end-measuring sensors.
Consequently, this function allows simple, low-cost pressure control, tension
control, or other control applications requiring high-speed mechanical mea-
surement (distortion/thickness/length).
Note The analog input responsiveness has been set relatively high to increase the
processing speed. The high responsiveness may result in input signal distor-
tion by external noise or interference. Take steps to suppress noise if the
Motion Control Module is being used in an environment with a lot of noise.
When the Motion Control Module’s analog input value is being used, addi-
tional noise countermeasures can be added to the program such as using
END refreshing and filtering the input values with AVG instructions.
I/O memory
User program
PRV
D
A
FQM1-MMA21
Motion Control Module
Selected signal range:
−10 to +10 V, 0 to 10 V,
0 to 5 V, 1 to 5 V, or
4 to 20 mA
Immediate
refreshing
Sensor
(pressure, displacement, etc.)
Stores the data
when instruction
is executed.
High speed input
(A/D conversion time:
40 µs)