Input Filter Time Parameter - WAGO 750 Manual

62 Commissioning
7.3.5.1

Input Filter Time Parameter

Configuring the input filter time changes the safety response time
If you change the Input Filter Time parameter, then the safety response time
also changes. You can read more about this in section "Safety Response Time."
The input filter time is used to suppress interference on the input signal.
The Input Filter Time parameter sets the filter time for all channels of the F I/O
module's digital inputs. Setting the input filter time to "0 ms" deactivates the input
filter.
Note that the minimum signal duration on a digital input depends on the input
filter time setting.
The input filter causes the F I/O module's detection of signal changes at a digital
input to be delayed by the duration of the input filter time. For example, if the
signal voltage on the digital input switches from "1" to "0" (1-0 signal change) for
a safety request (e.g., emergency stop request), the signal voltage "0" must be
present for this minimum signal duration.
If the signal voltage is present on the digital input for less than the minimum
signal duration, the signal change is not detected by the F I/O module. The cycle
time of the safe communication must also be taken into account. If it is too large,
it may not be possible to transmit the request to the safe controller.
Measures to take in case of interference on signal lines
If interference can occur on the signal lines, use shielded signal lines, or increase
the input filter time and the test pulse duration to avoid possible passivation of
the input channels of the F I/O module or incorrect requests for the safety
functions.
Manual
Version 1.0.0, valid from HW/SW Version 01/01
WAGO I/O System 750
753-661/000-004 4FDI 24V PROFIsafe