5. Initial Programming
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ATTENTION:
The upload recovers the last project stored in the controller as described in the previous paragraphs.
In case only the download for execution of a specific applicative occurs, it will not be possible to be
recovered through upload.
CPU Operating States
Run
When a CPU is in Run mode it indicates that all application tasks are in execution.
Stop
When a CPU is in Stop mode it indicates that the application tasks are stopped. The variable values
in the tasks are kept with the current value and output variables assume defined values by the user.
When a CPU switches for the Stop mode from the submitting of an application, the variables in the
application tasks will be lost with the exception of the persistent type variables. The output variables
will assume the defined value by the user and then the outputs value will switch for the safe state. As
the new application is loaded, the output variables will assume again the defined value by the user.
Breakpoint
When a debugging mark is reached in a task, it is interrupted. All the active tasks in the application
will not be interrupted, they will continue their execution. In this mode it is possible to go through a
program in the Online mode. A step by step can be executed and the debugging interruptions
positions depend on the editor.
For further information about the use breakpoints, please consult the MasterTool IEC XE Utilization
Manual - MU299609.
Exception
When a CPU is in Exception it indicates that some improper operation occurred in one of the
application active tasks. The task which caused the Exception will be suspended and the other tasks
will pass for the Stop mode. It is only possible to take off the tasks from this state and set them in
execution again after a new CPU start condition. Therefore, only with a Reset Warm, Reset Cold,
Reset Origin or a CPU restart puts the application again in Run mode.
Reset Warm
This command puts the CPU in Stop mode and starts all the application tasks variables, except the
persistent and retentive type variables. The variables started with a specific value will assume exactly
this value, the other variables will assume the start standard value.
Reset Cold
This command puts the CPU in Stop mode and starts all the application tasks variables, except the
persistent type variables. The variables started with a specific value will assume exactly this value,
the other variables will assume the start standard value (zero).
Reset Origin
This command removes all the application tasks variables, including the persistent type variables and
deletes the CPU application.
Notes:
Reset: When a Reset is executed, the breakpoints defined in the application are disabled.
Command: In order to execute a command from any type of Reset, is necessary to be in Online
mode on CPU.
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