ifm Vision Assistant O3M
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16.2 Text replacements and conditional codes
The O3M2xx series with internal overlay can e .g . display text . The text can be static text that never
changes . Alternatively, the text can indicate changing values, such as function results or the system
status (dynamically) . Moreover, the text can only be displayed under certain conditions, e .g . if a certain
value is calculated or if a certain event occurs .
Procedure of the O3M2xx:
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Fixed text can be entered in the Vision Assistant exactly the way it is supposed to be displayed,
without additional "decoration" or property settings .
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Dynamic text that is also supposed to include system status information or function results requires
a code . This code is called "test replacement code" because the camera replaces this code with real
values during the runtime . These text replacement codes begin with a percentage sign ("%") that is
followed by 2 characters (letters and numbers); 2 or 3 additional numbers can follow .
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Sometimes the text replacement codes are replaced by a number, even if a word or a sentence would
be more informative . The reason for this are the different languages . In this case, different texts can
be set that are only shown if the referenced variable has a specific value . This is one way to use
conditional codes .
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Sometimes it only makes sense to display a text or an icon if "something" happens, i .e . if a certain
event occurs . This is expressed by adding a condition . The condition describes the occurrence or
absence of “something”. In most cases, the condition refers to a diagnostic status or the result of a
function, a process value (e .g . it could make sense to display a warning if a collision was predicted
- this is a function-related condition . Or it could make sense to display a message if something is
blocked or the sensor window is soiled - this is a diagnostics-related condition) .
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The conditions are Boolean expressions . These expressions are evaluated for each frame . If an
expression is true, the attributed icon, text or graphic will be displayed .
16.2.1 Example
The following image demonstrates some text replacements and conditions . The explanation is below the
image:
Time to collision: %10 s
: the %10 will be replaced by the actual time before a predicted collision . The
resulting text could be (in case the time to collision is e .g . 3sec .):
Time to collision: 3 s
Distance 14 m
: The %14 will be replaced by the current distance to the object for which the collision was
predicted . The text would be (in case the distance is e .g . 9m):
Distance 9 m
Speed: %13 m/s
: the %13 will be replaced by the own speed as indicated by a J1939 message on the
CAN bus, e .g . 8 m/s ( ~ 29km/h) :
Speed: 8 m/s
