Direct digital control systems

1
Direct digital control systemsSoftware

• Introduction
• DDC Structure
• The position algorithm
• The velocity algorithm

2
Analog process
3
Direct digital control
4
(No Transcript)
5
(No Transcript)
6
(No Transcript)
7
(No Transcript)
8
DDC

• Centralized User Interface
• Dynamic, Precise Facility Control
• Coordination of Facility Systems Operation
• Speed and Reliability from Computational Power
• Optimizing Facility Diversity
• Durability and Flexibility
• Troubleshooting/Easing of maintenance
• Trending and History Data Logging
• Customized Energy Reporting

9
(No Transcript)
10
(No Transcript)
11
DDC for chemical reactor
12
DDC structure
13
(No Transcript)
14
(No Transcript)
15
(No Transcript)
16
(No Transcript)
17
(No Transcript)
18
The Position algorithm
19
(No Transcript)
20
(No Transcript)
21
(No Transcript)
22

23
(No Transcript)
24
The Velocity Algorithm
25
(No Transcript)
26
(No Transcript)
27
Two-Position Control
28
(No Transcript)
29
Two measure problems inVelocity algorithm

• CONTROLLER DRIFT
• Integral over shoot

30
Effect of set point band in Velocity algorithm
31
Benefits of DDC

• Improved Effectiveness

Improved Operational Efficiency
increased Energy Efficiency
32
(No Transcript)