Rockwell Automation 9301 Series RSView32 Users Guide - Manual (Page 415)

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RSView32 User’s Guide
Using expressions
Many types of animation require an expression. You can use
expressions involving tag values, constants, mathematical equations,
and if–then–else program logic for animation. A tag name or tag
placeholder can be included as part of an expression, or it can stand
alone as the entire expression.
This chapter does not provide detailed information on creating
expressions. If you are not familiar with the expression language, see
Chapter 14, Creating expressions, before you begin.
Setting minimum and maximum values
Many types of animation require a minimum and maximum range for
an expression. These values determine the start and end points for a
range of motion.
1.
When configuring animation, do one of the following:
use the tag’s minimum and maximum values—this is the default, so
you do not have to do anything. The values are taken from the
Minimum and Maximum fields in the Tag Database editor.
specify minimum and maximum values by selecting the Specify
check box and then typing minimum and maximum values
Why specify minimum and maximum values?
The minimum and maximum values specified for a tag in the Tag
Database editor limit the range of values that can be written to the
programmable controller but do not limit the values that are read.
Therefore, a tag’s actual minimum and maximum values might be
greater than those specified in the Tag Database editor. If so, you
might want to specify the tag’s actual minimum and maximum values
when configuring an object.