Siemens SIMATIC ET 200S Operating Instructions Manual page 280

2PULSE
5.3 Modes and Functions
Minimum Pulse Duration/Minimum Interpulse Period of the Digital Output DO
The minimum pulse duration/minimum interpulse period of the digital output DO is 0.2 ms.
Make sure you take this into consideration when you set the on/off-delay and the pulse
duration/interpulse period of the digital input DI; otherwise, the response at the digital output
DO is not defined.
The Pulse Duration of the Digital Input DI Is Too Short
The 2PULSE detects a pulse that is too short on the negative edge on the digital input DI if:
Pulse duration + off-delay ≤ on-delay.
Response of the 2PULSE to a pulse duration that is too short:
• ERR_PULS is set.
• The current on-delay is deleted.
• The off-delay is not started.
• The signal level at the digital output DO remains at 0.
ERR_PULS is deleted at the next positive edge on the digital input DI.
Figure 5-12
280
The Pulse Duration Is Too Short
Technological Functions
Operating Instructions, 02/2007, A5E00124867-05