Rockwell-automation T8019 Trusted Process Control Algorithm Software P User Manual download pdf (Page 23)

Trusted

Process Control Algorithms T8019

Issue 8 Sep 07 PD-T8019 23

Parameters PV, R and H must be finite, i.e. not ±infinities or NaNs. Behaviour is not defined for any

other values. If negative values are specified for R or H, their ABS value will be used and the “param”

error counter will be incremented.

The function must record the sample time for the previous input value and calculate the rate of input

value change for the actual elapsed period.

In an overflow condition occurs, the function is to set Q

to PV>0, Q

OWN

to PV<0 and increment the

“overflow” error counter. In an underflow condition occurs, the function is to set Q

and Q

DOWN

FALSE and increment the “underflow” error counter.

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Rockwell-automation T8019 Trusted Process Control Algorithm Software P User Manual Page 23