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4. SAFETY OBSERVATION FUNCTION
(6) Noise rejection filter
(a) Summary
The noise rejection filter is a function to set a filtering time to reduce the noise of input signals. Set
the filtering time of noise rejection filter with [Pr. PSD12 Input device - Noise rejection filtering time
DI1] to [Pr. PSD17 Input device - Noise rejection filtering time DI6].
The tolerance to chattering or noise will rise when noise rejection filtering time is longer. However,
the response to input signals will be slower. The response to input signals will be faster when noise
rejection filtering time is shorter. However, the tolerance to chattering or noise will drop.
When the test pulses are in superposition at input signals, the noise rejection filtering time needs to
be set considering off time of the test pulses. The following shows the specific settings of the noise
rejection filtering time.
Executing a test pulse diagnosis
Using a switch
Not executing a test pulse diagnosis
Test pulses are in superposition at output
signal of the device.
Using a device
Test pulses are not in superposition at output
signal of the device.
(b) Parameter setting
With the following parameters, set the noise rejection filtering time to each input device to which
function is assigned with [Pr. PSD02 Input device selection DI1] to [Pr. PSD07 Input device selection
DI6]. Also, the response time of input devices will change depending on the noise rejection filtering
time, refer to section 4.4.1 (7) in addition.
Structure
Parameter
PSD12
PSD13
PSD14
PSD15
PSD16
PSD17
Noise rejection filtering time
Set 0.888 ms or longer time than set time in [Pr. PSD26 Input
device - Test pulse off time].
Set 0.888 ms or longer time.
Set 0.888 ms or longer time than test pulse off time outputted
from the device.
Set 0.888 ms or longer time.
Input device - Noise rejection filtering time DI1
Input device - Noise rejection filtering time DI2
Input device - Noise rejection filtering time DI3
Input device - Noise rejection filtering time DI4
Input device - Noise rejection filtering time DI5
Input device - Noise rejection filtering time DI6
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