The configurable filtering is done in 2 stages: debounce and dechattering.

Debouncing can be used on all input functions and prevents the processing of fast state changes of the inputs, like for example, those caused by contact bouncing. Signal changes are ignored depending on the filter type and the preset time. The value range for the filter time is 0 to 255 ms; the value 0 deactivates the debounce filter. The selection of the debounce filter type "stable signal" or "integrating" affects all 8 inputs per function block.

Dechattering can only be used for event and counter inputs. It limits the number of events to a configurable value during a configurable time period. This should prevent multiple event registrations for the same input, e.g. disturbance influences due to slowly changing inputs (because the hysteresis is possibly set too small). The chatter counter is configurable for each individual input, the chatter time for each input pair. The selection of "dechattering" on the parameter screen activates the chatter filter for all 8 inputs per function block. The chatter filtering for individual inputs can always be disabled by selecting the value of 0 as chatter count value. A "Chatter Filter Active" bit within the "status" output word (Bit 7 - DC) which is returned from the transfer EFB "ERT_854_10" (see ERT_854_10: Data transfer EFB) signals that at least one "Chatter" input is being filtered. The bit is reset as soon as the chatter time of the last active filtered input has run out.