Lenze PLC Designer PLC Designer (R3-1) - Manual (Page 129)

L-force | PLC Designer
Concepts and Base Components
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DMS 4.1 EN 03/2011 TD29 127
Consider the following before going to do an Online Change:
Is the changed code without any errors?
Application specific initializations (reference run etc) will not be processed, because
the machine is keeping its state. Can the new program code really do without such
initializations?
Pointer variables keep their value from the last cycle. If you point on a variable which
now has changed its size, the value will not be correct any longer. For this reason
you should re-assign pointer variables in each cycle.
If the active step in a function chart gets removed, the chart will remain inactive.
Boot application (boot project)
Currently: At each successful download automatically the active application will be
stored in a file "application.app" in the target system folder, thus available as boot
application. Command 'Create boot application' allows also in offline mode to save the
boot application to a file.
A boot application is the project which will be started automatically when the
controller gets started ("booted"). For this purpose the project must be available on the
PLC in a file .app. This file can be created in offline or online mode by
command Create boot application (command category 'Online').
3.13 monitoring
In online mode there are various possibilities to display the current values of the watch
expressions of an object on the PLC:
• Inline monitoring in the implementation editor of an object. For details see the
description of the respective editor.
• Online view of the declaration editor of an object. For details see the description of
the declaration editor.
• Object-independent watch lists. For details see the description of the watch views.
• Trace sampling. Recording and display of variable values from the PLC. For details
see the description of the Trace functionality.
• Recipes. User defined set of variables for the purpose of writing and watching
these variables on the PLC. See Recipe Management.