User manual

101Publication LOGIX-AP010B-EN-P - May 2010 101
Chapter 5
Conversion of System Functions
Introduction
The purpose of this chapter is to examine the most commonly used S5 System
Functions and their RSLogix 5000 equivalents, and to show the range of
system functions available in RSLogix 5000 software.
Logix System Values
In RSLogix 5000 software, the equivalent of most S5 System Functions will be
the GSV (Get System Value) and the SSV (Set System Value) instructions.
These instructions access a hierarchy of objects (Classes, Instances and
Attributes) built-in to Logix controllers. The GSV and SSV pull-down menus
will guide you through parameter selection.
When you enter a GSV/SSV instruction, specify the object and its attribute
that you want to access. If there are multiple instances of the same object type,
it is necessary to specify the object name. For example, there can be several
tasks in your application. Each task has its own TASK object that can be
accessed by the task name.
The RSLogix 5000 online help provides detailed information on how to
access these system values and how to select the required Attribute Name in
the GSV/SSV instruction.