Instructions
9.4 PID basic functions
PID control
Function Manual, 03/2017, A5E35300227-AC
481
Operating principle of the pulse generator
The function PULSEGEN transforms the analog manipulated value LmnN through pulse
width module into an impulse sequence with the period duration PER_TM. PULSEGEN is
switched on with PULSE_ON = TRUE and is processed in the cycle CYCLE_P.
A manipulated value of LmnN = 30% and 10 PULSEGEN calls per PER_TM therefore
means:
● TRUE at output QPULSE for the first three PULSEGEN calls
(30% of 10 calls)
● FALSE at output QPULSE for seven further PULSEGEN calls
(70% of 10 calls)
The duration of a pulse per pulse repetition period is proportional to the manipulated variable
and is calculated as follows:
Pulse duration = PER_TM * LmnN /100
By suppressing the minimum pulse or break time, the characteristic curve of the conversion
develops "knees" in the start and end regions.
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