Siemens SIMATIC ET 200SP Manual page 50

Modes and Functions
3.5 On/Off-delay mode
Response of the TM Pulse 2x24V to a pulse duration that is too short:
● ERR_PULSE is set.
● The current On-delay is cleared.
● The Off-delay is not started.
● The signal level at the DQn.A digital output remains at 0.
ERR_PULSE is cleared at the next positive edge on the DIn.0 digital input.
Figure 3-9 DIn.0 pulse duration too short
The interpulse duration of the DIn.0 digital input is too short
The TM Pulse 2x24V detects an interpulse duration that is too short on the positive edge on
the DIn.0 digital input if:
Interpulse duration + On-delay ≤ Off-delay.
● Case 1: Interpulse duration < input delay time: The DIn.0 input interpulse is filtered out
and ignored (no error occurs).
● Case 2: Interpulse duration + On-delay time ≤ Off-delay time (error is set).
● Case 3: Interpulse duration + On-delay time < Off-delay time + minimum inter-pulse
duration (error is set).
Response of the TM Pulse 2x24V to an interpulse duration that is too short:
● ERR_PULSE is set.
● The current Off-delay is cleared.
● The On-delay is not started.
● The signal level at the DQn.A digital output remains at 1.
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Technology module TM Pulse 2x24V (6ES7138‑6DB00‑0BB1)
Manual, 09/2015, A5E35061186-AA