Siemens SIMATIC ET 200S Operating Instructions Manual page 338

2PULSE
5.7 Application Examples
On/Off-Delay Mode
Use channel 0 of the 2PULSE in on/off-delay mode to control the valve. In this mode, the
2PULSE generates a 24 V control signal at its DO digital output to control the valve. This 24
V control signal is switched on and off with the 24 V enable signal.
Sequence
1. Starting the procedure: To start the process, use the software enable (SW_ENABLE) on
2. Monitoring the procedure: The error detection/diagnostic function allows you to check by
3. End of the procedure: You can tell on the program by evaluating the STS_DO (status of
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your control program. The 2PULSE uses the 24 V enable signal (DI digital input) to check
whether a metal object is positioned at the initiator. The valve is opened on expiration of
the on-delay. If the metal object goes past the initiator, the valve is closed after the off-
delay has expired.
means of a program that the valve is being controlled correctly.
the 24 V control signal) when the process has ended.
Figure 5-31 Flow Diagram for Applying a Protective Layer
Technological Functions
Operating Instructions, 06/2010, A5E00124867-07