Siemens SIMATIC ET 200S Operating Instructions Manual page 297

Truth Table
Software enable Digital input DI
SW_ENABLE
1 0 → 1
1 1 → 0
0 Any status
1 Any status
0 → 1 0
Minimum Pulse Duration/Minimum Interpulse Period of the Digital Output DO
The minimum pulse duration/minimum interpulse period of the digital output DO amounts to
100 µs.
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 5-13
Technological Functions
Operating Instructions, 06/2010, A5E00124867-07
Digital output DO
0, if on-delay > 0
1, if on-delay = 0
1, if off-delay > 0
0, if off-delay = 0
0
Previous status remains
0
The Pulse Duration Is Too Short
5.4 Modes and Functions
STS_ENABLE Output
sequence
1 Start
1 Start
0 Cancel
1 -
1 -
2PULSE
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