Rockwell Automation T8019 Trusted Process Control Algorithm Software Package - Manual (Page 21)

Trusted
TM
Process Control Algorithms T8019
Issue 8 Sep 07 PD-T8019 21
Example:
T_AVG
OUT
PV
250ms
20ms
T (ms) 350 390 432 475 521 565 607 650 690 732 777 821
PV 23.5 15.46 10.01 56.03 58.61 90.17 85.68 84.56 18.09 95.94 75.66 49.38
Ts (ms) 46 40 42 43 46 44 42 43 40 42 45 44
% of Tp 103.2 102.4 101.6 102.8 102.8 104.4 102.8 104.0 103.2 102.8 102.4 102.4
OUT 23.50 22.87 21.09 22.71 28.76 37.26 48.00 58.53 64.87 68.91 73.96 71.92
Table 3 Example Time Average
The example assumes that PV has been static at 23.5 for greater than 250 ms before the first sample
shown. The Ts row shows the actual interval between samples. The % of Tp row shows the figure
used for the overall output adjustment; e.g., the actual period between the 521ms and 777ms iterations
is 256ms, i.e. 102.4% of Tp.