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Connections: Principle

In circuit diagram pages, connection points of components or connection symbols which are precisely opposite one another, horizontally or vertically, will automatically be connected. This is called autoconnecting, and the connection lines created this way are called autoconnect lines. When inserting and moving symbols, a preview of the autoconnecting lines is shown.

The autoconnect lines are first purely graphic until the connections are generated. This occurs automatically for many actions (e.g., when a page is opened) but can also be performed manually at any time. The individual connection can get its data from project settings, potentials, or connection definition points.

You use connection symbols such as T-nodes or double junctions to draw the course of the connections. Connection junctions and double junctions can be represented either as simple points or with target specification. In the latter case, the connection sequence is directly visible and is determined by the internal logic of the connection symbol (target tracking).

Connections are displayed in the schematic according to the specified line data. You can specify the line data for the project, for potentials, or for individual connections.

Connection sources and targets

A connection always has information about what it is connected to at both ends, the source and the target. The device tags of the connected functions are compared by default to determine the source and target. The sorting of the structure identifiers in the structure identifier management will be used for these comparisons; the "smaller" device tag will become the source. In addition, unplaced connections will be considered as well. If there are more than one connection between two functions, then one function is always the source for all connections, and the other function is always the target for all connections.


  • Connection symbols (e.g. angles, T nodes) are not targets. Shields are often connected on one side, in which case the shield is itself the target.
  • The setting Determine the source and target of connections from the placement can be used to specify that the source and target of the connections are not determined via the DT, but rather via the graphical position of the connected functions (command path: File > Settings > Projects > "Project name" > Connections > General). This is the same behavior as in EPLAN before version 1.9  SP 1. Cable connections are not affected by this setting.

Exchange source and target

You can use the command Exchange source and target to respectively exchange the source and target including the source- and target-dependent connection properties for the connections marked in the graphical editor, in the connections navigator, in the page navigator or in the layout space navigator (Tab Connections > Command group Connections > Source and target).

In addition, the sequence of the routing paths passed through is reversed in the properties Layout space: Routing track (ID 31095) and Topology: Routing track (ID 20237).

If a connection exists in several representation types in a project, source and target are exchanged globally. The direction of the connection is then the same at all representation types.

The following connection properties are exchanged:

Source Target
ID Property ID Property
31098 Dual sleeve prescribed at 2 targets at the source 31099 Dual sleeve prescribed at 2 targets at the target
31114 Routing direction source 31115 Routing direction target
31148 Routing track source: X coordinate 31151 Routing track target: X coordinate
31149 Routing track source: Y coordinate 31152 Routing track target: Y coordinate
31150 Routing track source: Z coordinate 31153 Routing track target: Z coordinate
31053 Source: Sleeve cross-section 31054 Target: Sleeve cross-section
31080 Connection: Connection point length source 31083 Connection: Connection point length target
31055 Source: Stripping length 31056 Target: Stripping length
31051 Wire termination processing source 31052 Wire termination processing target
31096 Connection dimension source 31097 Connection dimension target
31100 Layout space: Specification for entry into routing path network (source) 31116 Layout space: Specification for entry into routing path network (target)

Predefining functions as the source / target of the connection

You can also determine the source and target of connections manually. To do this use the Source / Target connection property at the connected functions. This property is available to you in the property dialog of functions in the subsequent dialog Connection point logic. Specify here whether the connection point determines the source or the target of the connection. If the "Undefined" entry is selected, source and target of the connection are determined via the DT or - if the Determine the source and target of connections from the placement project setting is activated - page-oriented in accordance with the graphical sequence.

The property can, for example, be used in device macros or stored in symbols that you created yourself. For Cable connections you can control the source and target via this property, if the Determine source and target of the cables via the cable connections project setting is activated.

See also