Siemens SIMATIC ET 200S Operating Instructions Manual page 306

2PULSE
5.4 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.
Procedure
1. Starting process: To start the process, use the software enable (SW_ENABLE) on your
2. Monitoring process: The error detection/diagnostic function allows you to check by means
3. Terminating process: You can tell on the program by evaluating the STS_DO (status of
Figure 5-27
306
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.
of a program that the valve is being controlled correctly.
the 24 V control signal) when the process has ended.
Flow Diagram for Applying a Protective Layer
Technological Functions
Operating Instructions, 02/2007, A5E00124867-05