Rockwell-automation Logix5000 Controllers Add-on Instructions Programm Uživatelský manuál stáhnout pdf (Strana 27)

Designing Add-On Instructions Chapter 1

Aspect Main Routine Subroutine Add-On Instruction

Accessibility N/A

Within program (multiple copies, one for

each program)

Anywhere in controller (single copy for the

entire project)

Parameters N/A Pass by value

Pass by value with Input and Output

parameters

Numeric parameters N/A No conversion, user must manage

Automatic data type conversion for Input

and Output parameters

Parameters data types N/A Atomic, arrays, structures

Atomic for any parameter

Arrays and structures must be InOut

parameters

Parameter checking N/A None, user must manage

Verification checks that correct type of

argument has been provided for a

parameter

Data encapsulation N/A

All data at program or controller scope

(accessible to anything)

Local data is isolated (only accessible

within instruction)

Monitor/debug In-line code with its data

Mixed data from multiple calls, which

complicates debugging

Single calling instance data, which

simplifies debugging

Supported programming languages FBD, LD, SFC, ST FBD, LD, SFC, ST FBD, LD, ST

Callable from N/A FBD, LD, SFC, ST FBD, LD, SFC through ST, ST

Protection Locked and view only Locked and view only Locked and view only

Documentation Routine, rung, textbox, line Routine, rung, textbox, line

Instruction, revision information, vendor,

rung, textbox, line, extended help

Execution performance Fastest

JSR/SBR/RTN instructions add overhead

All data is copied

Indexed reference impact

Call is more efficient

InOut parameters are passed by reference,

which is faster than copying data for many

types

Parameter references are automatically

offset from passed-in instruction tag

location

Memory use Most used Very compact

Compact call requires more memory than a

subroutine call

All references need an additional word

Edit Online/offline Online/offline Offline only

Import/export

Entire routine, including tags and

instruction definitions to L5X

Entire routine, including tags and

instruction definitions to L5X

Full instruction definition including

routines and tags to L5X

Instruction signature N/A N/A

32-bit signature value seals the instruction

to prevent modification and provide high

integrity

Rock well Automati on Publication 1756- PM010F-EN-P - Oct ober 2014 27

1 2 ... 22 23 24 25 26 27 28 29 30 31 32 ... 103 104

Komentáře k této Příručce

Žádné komentáře

Rockwell-automation Logix5000 Controllers Add-on Instructions Programm Uživatelský manuál Strana 27

Komentáře k této Příručce

Související produkty a manuály pro Zařízení Rockwell-automation Logix5000 Controllers Add-on Instructions Programm