The call frequency must be programmed by the user.
It is possible to synchronize the pulse output with the block that updates the input variable
INV (for example CONT_C). This ensures that a change in the input variable is output as
quickly as possible as a pulse. The pulse generator evaluates the input value INV at inter-
vals corresponding to the period PER_TM and converts the value into a pulse signal of
corresponding length. Since, however, INV is usually calculated in a slower cyclic inter-
rupt class, the pulse generator should start the conversion of the discrete value into a
pulse signal as soon as possible after the updating of INV. To allow this, the block can
synchronize the start of the period using the following procedure:
n If INV changes and if the block call is not in the first or last two call cycles of a period,
the synchronization is performed. The pulse duration is recalculated and in the next
cycle is output with a new period.
The automatic synchronization can be disabled at the SYN_ON input (= FALSE).
With the beginning of a new period, the old value of INV (in other words,
of LMN) is simulated in the pulse signal more or less accurately following
the synchronization.
Depending on the parameters assigned to the pulse generator, PID controllers with a
three-step output or with a bipolar or monopolar two-step output can be configured. The
following table illustrates the setting of the switch combinations for the possible modes.
Automatic Synchroniza-
tion
Modes
VIPA SPEED7
Standard
PID Control > FB 43 - PULSGEN - Pulse generation
HB00 | OPL_SP7 | Operation list | en | 18-30 850
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