Pulse Train Mode - Siemens SIMATIC ET 200S Operating Instructions Manual

2PULSE
5.3 Modes and Functions
5.3.4

Pulse Train Mode

Definition
The 2PULSE outputs the number of pulses you specified as a pulse train at the DO digital
output on expiration of the set on-delay (output sequence). The period duration and pulse
duration of the pulses can be adjusted.
Figure 5-8
Starting 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 DI digital input of the 2PULSE as HW enable with the DI function
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 at 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 software enable has been issued, a
positive edge of the hardware enable is enough to start the next output sequence.
When the enable is issued (positive edge), the on-delay is started and the STS_ENABLE
set. On expiration of the on-delay, the pulse train is output with the set number of pulses.
The output sequence finishes as soon as the last pulse has been output; STS_ENABLE is
deleted.
If you make an impermissible change to the number of pulses during operation, the
ERR_PULS signal indicates a pulse output error.
At the next output sequence, the 2PULSE deletes the ERR_PULS feedback bit.
272
Basic Circuit Diagram for Pulse Train Mode
Technological Functions
Operating Instructions, 02/2007, A5E00124867-05