Rockwell-automation Logix5000 Controllers Add-on Instructions Programm Manual de usuario descargar pdf (Pagina 6)

Table of Contents

Using standard and safety tags ........................................................................ 34

Data access control............................................................................................. 34

Constant values................................................................................................... 35

External Access.................................................................................................... 35

Planning your Add-On Instruction design ......................................................... 36

Intended behavior .............................................................................................. 36

Parameters ............................................................................................................ 37

Naming conventions ......................................................................................... 37

Source protection ............................................................................................... 37

Nesting - reuse instructions ............................................................................. 37

Local tags .............................................................................................................. 37

Programming languages.................................................................................... 38

Scan mode routines............................................................................................ 38

Test ........................................................................................................................ 38

Help documentation ......................................................................................... 38

Chapter 2

Creating an Add-On Instruction .......................................................................... 39

Creating a parameter................................................................................................. 40

Creating a module reference parameter ............................................................... 42

Creating local tags...................................................................................................... 44

Editing parameters and local tags........................................................................... 45

Updates to arguments following parameter edits.............................................. 46

Copying parameter or local tag default values.................................................... 47

Creating logic for the Add-On instruction......................................................... 48

Execution considerations for Add-On Instructions ................................. 49

Optimizing performance.................................................................................. 49

Defining operation in different scan modes ....................................................... 49

Enabling scan modes ................................................................................................. 50

Prescan routine ................................................................................................... 51

Postscan routine ................................................................................................. 53

EnableInFalse routine ....................................................................................... 54

Using the EnableIn and EnableOut parameters ................................................ 56

EnableIn parameter and ladder diagrams..................................................... 57

EnableIn parameter and function blocks ..................................................... 57

EnableIn parameter and structured text....................................................... 57

Changing the class of an Add-On Instruction ................................................... 57

Testing the Add-On Instruction ........................................................................... 58

Before you test..................................................................................................... 58

Testing the flow .................................................................................................. 58

Monitoring logic with data context views ................................................... 59

Defining Add-On Instructions

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

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Rockwell-automation Logix5000 Controllers Add-on Instructions Programm Manual de usuario Pagina 6

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