35 CPU MODULE BUILT-IN ANALOG FUNCTION
35.5 Function (PID Control Via Instruction)
605
35
Input filter constant (s3)+2
The input filter () is a software filter to reduce the fluctuation of the measured value (PV) caused by noise. By setting this time
constant of the filter according to the control target characteristics and noise level, the effect of noise can be reduced. If the
input filter value is too small, the filter effect is small. If the input filter value is too large, the input response is bad. Setting
range: 0 to 99 (%).
Because the input filter () acts on the target value (SV), all of the proportional operation, integral operation and differential
operation are affected.
Measured value (PV) processed
by input filter
Input amplitude
Pulse input by noiseActual measured value (PV)
Time
Time
Time
Time
Input amplitude processed
by input filter
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