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ABB AC 800M Library Object Style Guide
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Conditional Range Chec
k
Section 6 Pro
gram Code Issues
106
3BSE042835
-600
if MyPar > MyLimit then
(* No assignment, use last good value *)
ParErrorInt := true;
else
MyParInt := MyPar;
end;
(* More range checked assignments ... *)
else
(* Assignment without range checks *)
MyParInt := MyPar;
(* More assignments ... *)
end_if;
Note that
MyPar
is copied to a local v
ariable beca
use it is not allowed to change IN
parameters.
105
107
Table of Contents
Default Chapter
5
Table of Contents
5
About this User Manual
9
General
9
Document Conventions
10
Warning, Caution, Information, and Tip Icons
10
Terminology
11
Related Documentation
11
Section 1 Libraries
13
Introduction
13
Purpose
13
Library Categories
14
Standard Libraries
14
User Defined Libraries
15
Object Libraries
15
Library Dependencies
15
Connected Libraries
15
Split Libraries
16
Support Libraries
16
Naming Convention
17
Section 2 Types
19
Naming
19
Object Types
19
Compound Words and Abbreviations
21
Suffixes
22
Name Space
24
Section 3 Parameter Interface
25
Naming Convention
25
Compound Words and Abbreviations
25
Parameter Properties
26
Data Type
27
Attributes
27
Parameter for Control Modules and Diagrams
28
Parameter for Function Blocks
30
FD Port
30
Initial Value
31
Description
31
Parameters with Special Purposes
33
Name
33
Description
34
Interactionpar
36
Parerror
37
Connections
37
Parameters for Alarm Handling
39
Monitoring Continuous Execution
39
Section 4 Engineering Interface
41
General
42
Template Design
43
Control Module Design
43
Graphical Layers
43
Grid and Coordinate System
46
Layers and Interaction Windows
47
Icons
48
Function Block Design
51
Parameter Names
51
Function Block Example
52
Diagram Design
57
Data Flow Order
58
Execution Order
60
Reverse and Display Value Attribute on Data Types in Diagrams
61
Reverse Attribute on Data Types in Diagram Types
61
Variable and Parameter
62
Interaction Windows in Online Mode
63
Introduction
63
Interaction Windows
65
Information Windows
65
When to Use Interaction Windows
65
Window Appearance
66
Design
67
Interaction Principles
69
Section 5 Operator Interface
71
Introduction
71
Operator Workplace Interaction
72
Faceplates
72
Display Elements
74
National Language Support (NLS)
75
Interface between Control Builder and Operator Workplace
75
Interaction Principles
76
SIL Considerations
77
Access Level
77
Support for Confirm Operation Dialog
78
Graphical Indication of Parerror
83
The Operator Workplace Graphics
83
Section 6 Program Code Issues
85
Program Code
85
Descriptions
86
Variables and Project Constants
87
Object Sub-Structures
88
Protection and Scope
88
Re-Use of Code
89
Control Module Types
91
Function Block Types
93
Diagram Types
93
Data Types
93
Templates
94
Task Considerations
94
Parameter Dependency on Tasks and Controllers
95
Calls to Asynchronous Functions
95
Special Functions
96
Handling of Input and Output Values
96
Error Handling
97
Alarm and Event Handling
97
Program Stop Complication
101
Power Failure Behavior
102
State Algorithms and Bumpless Parameters Changes
102
Range Check
103
Conditional Range Check
105
Overflow Handling
107
SIL Mark Restrictions
107
Appendix A Names and Abbreviations
109
Suggested Names
109
Recommended Names and Abbreviations
109
Standard Library Parameters
113
Bse042835
114
Index
117
Index
118
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ABB AC 800M Specifications
General
Brand
ABB
Model
AC 800M
Category
Controller
Language
English
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