ProSoft Technology ProLinx S3964R User Manual download pdf (Page 7)

Publication LOGIX-AP010B-EN-P - May 2010 7

Preface

Purpose

This user manual provides guidance for users and engineers who have used

control systems based on one of these two platforms:

• Siemens S5 Controller

• Rockwell Automation Logix Programmable Automation Controller

(PAC)

And in addition:

• have a desire or must take advantage of the PAC features, or are in the

early stages of migrating a S5 to Logix.

• have STEP 5 program code that they wish to convert to effective and

efficient RSLogix 5000 code.

Use this manual to help you adopt good practices and to avoid common

mistakes when converting the project to Logix.

Conversion versus

Translation

The theme of conversion versus translation is one that is repeated in this

application conversion guide. Simple translation is focusing only on the line of

code and finding an equivalent in the Logix languages. To convert an

application optimally, you have to do more than just translate. For instance,

you may benefit from choosing another programming language, utilizing other

programming techniques, and designing another scheduling scheme to solve

the same task. So, conversion is performed in a context of a higher level design

and knowledge of the strengths of the Logix system.

If you have application code to convert, you must understand your STEP 5

program before you start conversion – by having been involved yourself in its

development, or by reading documentation of the program and of the process

that it controls. If the program or the process is unfamiliar or poorly

documented, proper conversion will be difficult – it will be mere translation

and is less likely to succeed. For example, in Logix, there is a global name

space, whereas in the Siemens environment there are data blocks that can be

loaded/unloaded by application code. Appreciation of this helps you design a

strategy for conversion.

In cases where process and program documentation is poor, it may be more

cost effective to draw up a new specification and begin your Logix program

with minimal time spent on translating the old program.

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ProSoft Technology ProLinx S3964R User Manual Page 7