Rockwell-automation Logix5000 Controllers Add-on Instructions Programm Manuel d'utilisateur Page 28
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Chapter 1 Designing Add-On Instructions
Programmatic access to data
Input and Output parameters and local tags are used to define an
instruction-defined data type. Each parameter or local tag has a member in the
data type, although local tag members are hidden from external use. Each call to an
Add-On Instruction uses a tag of this data type to provide the data instance for the
instruction's execution.
The parameters of an Add-On Instruction are directly accessible in the controller's
programming through this instruction-defined tag within the normal tag-scoping
rules.
Local tags are not accessible programmatically through this tag. This has impact on
the usage of the Add-On Instruction. If a structured (including UDTs), array, or
nested Add-On Instruction type is used as a local tag (not InOut parameters),
then they are not programmatically available outside the Add-On Instruction
definition.
Tip: You can access a local tag through an alias parameter.
See Creating an Alias Parameter for a Local Tag on page 31
.
Unavailable instructions within Add-On Instructions
Most built-in instructions can be used within Add-On Instructions. The
following instructions cannot be used.
Unavailable Instruction Description
BRK Break
EOT End of Transition
EVENT Event Task Trigger
FOR For (For/Next Loop)
IOT Immediate Output
JSR Jump to Subroutine
JXR Jump to External Routine
MAOC Motion Arm Output Cam
PATT Attach to Equipment Phase
PCLF Equipment Phase Clear Failure
PCMD Equipment Phase Command
PDET Detach from Equipment Phase
POVR Equipment Phase Override Command
RET Return
SBR Subroutine
SFP SFC Pause
SFR SFC Reset
28 Rockwell Automation Publication 1756-PM010F-EN-P - October 2014
- 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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