User Manual

ManualsBrandsRockwell Automation ManualsEquipmentT80011 Application Note Application Variable Limit Check

Trusted

AN-T80011

Issue 1 Dec 07 AN-T80011 1

Application Note

Application Variable Limit Check

Technical Alert TA20004 describes how an overflow in the numbering of temporary (internal un-

named) variables in a compiled application can cause corruption of I/O variables without warning. This

may occasionally affect large applications but is unlikely in small applications.

This document describes how to check for the temporary variable numbering overflow.

Issue Record

Issue

Number

Date Revised by Technical

Check

Authorised by Modification

1 Dec 07 Nick Owens Pete Stock Gerry Creech Initial Issue

Summary of content (4 pages)

PAGE 1
TrustedTM AN-T80011 Application Note Application Variable Limit Check Technical Alert TA20004 describes how an overflow in the numbering of temporary (internal unnamed) variables in a compiled application can cause corruption of I/O variables without warning. This may occasionally affect large applications but is unlikely in small applications. This document describes how to check for the temporary variable numbering overflow.
PAGE 2
TrustedTM AN-T80011 Application Variable Limit Check 1. Application Variable Limit Check 1.1. Compiled file appli.h Compile the application as normal. When compilation is complete, before downloading or updating, open Windows Explorer and navigate to the Toolset application folder. This will normally be a subfolder of c:\Trusted\Toolset\apl. In this folder, find a file called appli.h. The file size is a reasonable guide to the chances of having a problem.
PAGE 3
TrustedTM AN-T80011 Application Variable Limit Check In the example below, all variables addressed from 0X0000 onwards will overwrite other data.
PAGE 4
ICS Triplex technologies and services are available worldwide. Regional Headquarters: Americas: 4325 West Sam Houston Parkway North, Suite 100 Houston Texas 77043-1219 USA Tel: +1 713 353 2400 Fax: +1 713 353 2401 Europe, ME & Africa: Hall Road Maldon Essex CM9 4LA UK Tel: +44 1621 854444 Fax: +44 1621 851531 Asia Pacific: Unit 2/12 Keegan Street O’Connor Western Australia Tel: +61 89 314 7787 Fax: +61 89 314 7786 www.icstriplex.com For technical support email: support@icstriplex.