Rockwell Automation T8019 Trusted Process Control Algorithm Software Package - Manual (Page 4)

Trusted
TM
Process Control Algorithms T8019
Issue 8 Sep 07 PD-T8019 4
Table of Contents
1. Description ...................................................................................................................................7
1.1. Functions .....................................................................................................................................8
1.1.1. Square Root Extraction................................................................................................................8
1.2. BCD Translation...........................................................................................................................9
1.3. Analogue Select.........................................................................................................................10
1.4. Multiple Value Averaging ...........................................................................................................10
1.5. Drum Level Control....................................................................................................................11
1.6. Mass Flow Computation ............................................................................................................11
2. Function Blocks .........................................................................................................................12
2.1. Analogue Scaling .......................................................................................................................12
2.2. Analogue Value Clamping .........................................................................................................13
2.3. Low Value Select .......................................................................................................................13
2.4. High Value Select ......................................................................................................................14
2.5. Median Value Select ..................................................................................................................14
2.6. Proportional PID Function..........................................................................................................15
2.7. Incremental PID Function ..........................................................................................................17
2.8. Deviation Alarm..........................................................................................................................19
2.9. Manual Tracking ........................................................................................................................19
2.10. Time Averaged Value ................................................................................................................20
2.11. Rate of Change Detection..........................................................................................................22
2.12. Analogue Value Slew.................................................................................................................24
3. Other Functions .........................................................................................................................25
3.1. Lead/Lag Control .......................................................................................................................25
4. Sample Application Program .....................................................................................................26
Figures
Figure 1 PID Function.............................................................................................................................16
Figure 2 IPID Function............................................................................................................................18
Figure 3 Sample Application Program ....................................................................................................26
Tables
Table 1 Error Statistics .............................................................................................................................7
Table 2 BCD Translation ..........................................................................................................................9
Table 3 Example Time Average .............................................................................................................21