PLC Programming

4 - The Individual Components
In order to go to the location in the editor where a certain breakpoint was set, highlight the respective
breakpoint from the list of set breakpoints and press the Go to button.
Breakpoint Editing Dialog Box
To set or delete breakpoints, you can also use the 'Online' 'Toggle Breakpoint' command.
'Online' 'Step over'
Symbol:
'Online' 'Step in'
Shortcut:
This command causes a single step to execute. If a POU is called, the program stops after its
execution. In SFC a complete action is executed.
If the present instruction is the call-up of a function or of a function block, then the function or function
block will be executed completely. Use the 'Online' 'Step In' command, in order to move to the first
instruction of a called function or function block.
If the last instruction has been reached, then the program will go on to the next instruction in the POU.
Shortcut:
A single step is executed. The program is stopped before the first instruction of a called POU.
If necessary, there will be a changeover to an open POU.
If the present position is a call-up of a function or of a function block, then the command will proceed
on to the first instruction in the called POU.
In all other situations, the command will function exactly as 'Online' 'Step Over'.
'Online' 'Single Cycle'
Shortcut: +
This command executes a single PLC Cycle and stops after this cycle.
This command can be repeated continuously in order to proceed in single cycles.
The Single Cycle ends when the 'Online' 'Run' command is executed.
'Online' 'Write values'
Shortcut: +
With this command, one or more variables are set – one time only! – to user defined values at the
beginning of a cycle. (see 'Online' 'Force values' for setting permanently)
The values of all single-element variables can be changed, so long as they are also visible in
Monitoring.
CoDeSys V2.3 4-55