Displaying Relations in the Gantt Chart

	Existing relationships between processes or individual cycles can be displayed in the Gantt Charts for processes and resources.
	The Possible Relationships in the Gantt Chart
	The following relationships are possible between processes in the Gantt Chart: Control flow Precedence constraints Previous cycles constraints
	Hiding Relationships in the Gantt Chart
	You can show specific relationships in the Gantt chart via the context menu or by using `Tools > Options > Digital Process for Manufacturing > GANTT Chart > Display activity relations bars`. To show a relationship in the Gantt Chart, open the context menu in the Gantt Chart by right clicking the mouse. You can select the relationship that should be displayed in the Gantt Chart from the context menu.
	Control flow
	A black arrow between two processes in the Gantt chart indicates a Control flow relationship. If a Control flow relationship exists between two processes, the first process must always end before the second process can begin. No other processes can be planned in between the end-time of the first process and the start-time of the second process.
	Precedence constraints
	A blue broken-lined arrow between two processes in the Gantt chart indicates a Precedence constraints relationship. If a Precedence constraints relationship exists between two processes, the first process must first end before the second can begin. In this case the start-time of the second process does not have to fall directly after the end-time of the first process. The start-time can also be set for a later point in time.
	Previous cycles constraints
	A blue arrow between two processes in the Gantt chart indicates a Previous cycles constraints relationship. If a Previous cycles constraints relationship exists between two processes, the first process in the foregoing cycle must end before the second process in the next cycle can begin. This can be viewed in the Resource Gantt Chart and Process centric Resource Gantt only.
	Example of a Previous cycles constraints relationship
	The example shows how a Previous cycles constraints relationship between two processes can be displayed, if the end-time and start-time of both processes fall in the same cycle – in the example A1.11 and A1.2 for both processes. If the end-time of the first process (Process A1.11) in the foregoing cycle lies after the start-time of the second process (Process A1.2) in the next cycle, the Previous cycles constraints relationship between these two processes will be displayed in the next cycle. The Previous cycles constraints relationship between the processes A1.11 and A1.2, is displayed inside the red box in the picture below.
	Multicycle in Resource Gantt
	When the start-times of processes are in the foregoing cycle and the end-time lies in the next cycle, this is generally referred to as an overlapping of two cycle durations. If processes overlap in the Gantt Chart, these processes are displayed in the front of the Gantt Chart, corresponding to the process duration of the next cycle. The processes for each cycle are individually displayed in color, and in a step by step fashion. The illustration below does not show overlapping. The cycle time amounts to 50 seconds. The illustration below shows an overlap. The cycle time was reduced to 30 seconds. The end-time for the processes P3 and P4 amount to 34.36 seconds and 37.71 seconds: Process P3 overlapped 4.36 seconds Process P4 overlapped 7.71 seconds According to the times above, process P3 and P4 are once again displayed in the front of the Gantt Chart (illustrated below in the red box).