Instructions
9.4 PID basic functions
PID control
Function Manual, 03/2017, A5E35300227-AC
493
PVDT0 228.0 REAL 0.0 Process value slew rate at start of tuning [1/s]
PVDT 232.0 REAL 0.0 Current process value slew rate [1/s]
Sign adapted.
PVDT_MAX 236.0 REAL 0.0 Max. change in the process value per second [1/s]
Maximum derivative of the process value at the point of inflection (sign
adapted, always > 0); is used to calculate TU and KIG.
NOI_PVDT 240.0 REAL 0.0 Noise action in PVDT_MAX in %
The higher the noise action, the less accurate (less aggressive) the
NOISE_PV 244.0 REAL 0.0 Absolute noise in process value
Difference between maximum and minimum process value in phase 1.
FIL_CYC 248.0 INT 1 Number of cycles of the mean value filter
The process value is determined through FIL_CYC cycles. FIL_CYC is
increased from 1 to a max. of 1024 if needed.
POI_CMAX 250.0 INT 2 Maximum number of cycles after point of inflection
This time is used to find another (i.e. better) inflection point for measur-
ing noise. The tuning is completed only after this time.
Number of cycles after inflection point
Operating principle of the pulse generator (Page 481)
Block diagram TCONT_CP (Page 484)
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