Chapter 5 Relay Ladder Logic Programming
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Illustrate diagram for Kp, Ti , Td variable setting value to SV
1, Td and Ti setting value is large. Kp setting value is small.
2, Td and Ti setting value is small.
3, Kp setting value is large.
A micro sampling time T
S
setting, will consume lots of resource of controller and variation value won’t have
sufficient change, A huge sampling time T
S
setting, expect stable system and a slow response.
Variable reference chart:
Control type
Application field
K
P
(%) T
I
(*0.1s) T
D
(*0.01s) T
S
(*0.01s)
Fast temperature
variation
Small space and capacity
625 30 100
50
Slow Temperature
variation
Large space and capacity
1250 120 800
100
Slow Pressure
Slow pressure variation
1500
5
400
100
Fast Pressure
Fast pressure variation
3750
2
1000
100
K
P
, T
I
, T
D
is adjustable after observe the application field.
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