Rockwell-automation Logix5000 Controllers Add-on Instructions Programm User Manual Page 35
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Designing Add-On Instructions Chapter 1
Constant values
InOut parameters may be designated as constant value tags to prevent their data
from being modified by controller logic. If the logic of an Add-On Instruction
contains a write operation to a constant value parameter, the Add-On Instruction
does not verify in the Add-On Instruction definition context.
External Access
External Access defines the level of access that is allowed for external devices, such
as an HMI, to see or change tag values.
Add-On Instruction Parameters and Tags External Access Options
Local tag
Read/Write
Read Only
None
Input parameter
Output parameter
EnableIn parameter
Read Only
EnableOut parameter
InOut parameter N/A
Rock well Automati on Publication 1756- PM010F-EN-P - Oct ober 2014 35
- Programming Manual 1
- Important user information 2
- Summary of changes 3
- Table of contents 5
- Chapter 2 6
- Chapter 3 7
- Chapter 4 7
- Using Add-On Instructions 7
- Importing and Exporting 7
- Add-On Instructions 7
- Table of Contents 8
- Preface 9
- Studio 5000 environment 9
- Additional resources 9
- Understanding terminology 10
- Chapter 1 13
- Introduction 13
- About Add-On Instructions 13
- Components of an Add-On 14
- Instruction 14
- Local tags 16
- Parameters 16
- Data Type 17
- Logic routine 18
- Optional Scan Modes routines 19
- Instruction signature 19
- Signature history 20
- Change history 21
- Considerations for Add-On 22
- Instructions 22
- Safety Add-On Instructions 23
- Safety instruction signature 24
- Programming languages 24
- Transitional instructions 25
- Instruction size 25
- Runtime editing 26
- Nesting Add-On Instructions 26
- Programmatic access to data 28
- ’this’ as the Instance Name 29
- Considerations when 30
- Data access control 34
- Constant values 35
- External Access 35
- Planning your Add-On 36
- Instruction design 36
- Naming conventions 37
- Source protection 37
- Nesting - reuse instructions 37
- Scan mode routines 38
- Help documentation 38
- Defining Add-On Instructions 39
- Creating a parameter 40
- Creating a module 42
- Creating local tags 44
- Editing parameters and 45
- Updates to arguments 46
- Copying parameter or local 47
- Creating logic for the 48
- Add-On instruction 48
- Defining operation in 49
- Enabling scan modes 50
- Prescan routine 51
- Postscan routine 53
- EnableInFalse routine 54
- Using the EnableIn and 56
- EnableOut parameters 56
- Changing the class of an 57
- Add-On Instruction 57
- Testing the Add-On 58
- Defining source protection 60
- Generating an Add-On 61
- Creating instruction help 63
- Project documentation 66
- Motor starter instruction 67
- Example Definition Editor 68
- Simulation instruction 71
- Ladder diagram configuration 72
- Including an Add-On 77
- Instruction in a routine 77
- Referencing a hardware 79
- Tips for using an Add-On 81
- Programmatically access a 81
- Starter Add-On Instructions 82
- Monitoring the value of a 84
- Viewing logic and monitor 85
- Determine if the Add-On 87
- Instruction is source 87
- Copying an Add-On 88
- Storing your Add-On 89
- Creating an export file 91
- Exporting to a single file 93
- Importing an Add-On 94
- Import configuration 95
- Updating an Add-On 96
- Instruction to a newer 96
- Rockwell Automation support 104
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