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7 APPLICATION INSTRUCTIONS
7.18 PID Instruction
Input filter (): (S3)+2
Setting range: 0 to 99[%]
PID control: proportional operation, integral operation, derivative operation
The input filter () is a software filter that reduces the variations caused by process value (PV) noise. Effects of noise can be
suppressed by setting the time constant of the filter according to the characteristics and noise levels of the control target.
• Too small a time constant reduces the effects of the filter.
• Too large a time constant deteriorates the response of input.
The input filter () acts on the set value (SV) and accordingly affects the proportional operation, integral operation, and
derivative operation.
Measured PV
Filtered PV
Pulse input due to noise
Amplitude of input
Amplitude of filtered input
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