Frequency Output" Operating Mode - Siemens SIMATIC ET 200S Operating Instructions Manual

5.4.6

"Frequency output" operating mode

Definition
A square wave signal with a specified frequency is output at the digital output of the
2PULSE.
The output sequence is started on expiration of the configured on-delay on the DO digital
output of the 2PULSE.
Figure 5-17
Starting the Output Sequence
You must always issue the enable for the output sequence by means of the software enable
(SW_ENABLE 0 → 1; MANUAL_DO = 0) in your control program.
The ACK_SW_ENABLE feedback bit indicates the software enable pending at the 2PULSE.
You can also set the digital input DI of the 2PULSE as a HW enable with the "Function DI"
parameter.
If you want to work with the software enable and hardware enable at the same time, when
the software enable has been issued, the output sequence starts with the first positive edge
of the hardware enable. Further positive edges of the hardware enable during the current
output sequence are ignored by the 2PULSE.
When the enable is issued (positive edge), the on-delay is started and the STS_ENABLE
set. The frequency output is started on expiration of the on-delay time. The output sequence
runs continuously as long as SW_ENABLE is set.
Technological Functions
Operating Instructions, 06/2010, A5E00124867-07
Block diagram for "Frequency output" operating mode
Frequency
2PULSE
5.4 Modes and Functions
303