Depending on the target system settings the user can activate resp. deactivate the Flow Control function. If it is activated, a check (✓) will appear in front of the menu item. Following this, every line or every network will be marked which was executed in the last PLC Cycle.
The line number field or the network number field of the lines or networks which just run will be displayed in green. In the graphic editors for the Function Block Diagram and Ladder Diagram, an additional field will be inserted in all connecting lines not transporting any Boolean values. When these Out- and Inputs are verified, then the value that is transported over the connecting line will be shown in this field. Connecting lines that transport only Boolean values will be shaded blue when they transport TRUE. This enables constant monitoring of the information flow.
1. The run time of a program will be increased by using flow control. This might cause timeouts in time-cyclic programs with high load.
2. At active breakpoint positions there is no flow control display.
3. If a watchdog has been defined for the concerned task, this will be switched off when the flow control is active.