Rockwell-automation Logix5000 Controllers Add-on Instructions Programm User Manual download pdf (Page 72)

Chapter 2 Defining Add-On Instructions

The following image shows the Simulation example logic.

Ladder diagram configuration

In this example, the instruction simulates a deadtime and lag (first order) process.

The Simulation_DT_1st instruction reads the control variable from the PID

instruction. The PID instruction reads the SimOutput Parameter of the

Simulation_DT_1st instruction.

72 Rockwell Automation Publication 1756-PM010F-EN-P - October 2014

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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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