Rockwell Automation 1771-PD PID MODULE (+DU) - Manual (Page 125)

Programming
Chapter 3
3Ć82
Figure 3.25
Lead Dominated Filter (Ratio of 4/x)
0 1 2 3 4 5 6 7 8 9 11 12 10
100
150
200
250
300
350
400
Step Input = 100
4
1.0
4
2.0
4
2.5
4
3.0
4
1.5
TB > TC
Lead
Lag TC
= TB
Response in seconds
Percent of step input
11130
Figure 3.26
Lag Dominated Filter (Ratio of x/4)
0
Step Input = 100
TB < TC
Lead
Lag TC
= TB
Percent of step input
11131
100
90
80
70
60
50
40
30
20
10
0
3.0
4
1.0
4
0.0
4
2.0
4
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 20 19 18
Response in seconds