The functionality of the cable is based on the connections. Since connections are not refreshed immediately while drawing, cables are also only up-to-date after the connections have been refreshed. The individual cable connections are either defined using connection definition points or using the Cable connection point property in the connection point logic of a function.
Cable sources and targets
Source and target of a cable are determined according to specific rules in EPLAN from the DTs of the functions that are connected to the individual cable connections. If contradictions occur (e.g., if two cable connections of a cable lead to different devices), the first graphical cable connection "wins". Every individual cable connection also has a source and a target whereby the first graphical DT is the source by default. The source of a cable connection can also be the target of a cable.
The source and the target that have a cable connection within the cable are displayed in the dialog Edit cable (for a marked cable). In the list view of the cable navigator on the other hand the source and the target of the individual connection is displayed. These can deviate from the source and the target of the cable connection in the cable.
Through the properties Cable: Source and Cable: Target the source and target of the cable in the schematic are shown at the cable. These properties can also be used in the block properties, during external editing and in reports.
Page-oriented determination of cable source and target
Alternatively to the determination by means of the specified rules, the source and target of a cable can also be determined through the source and target of the cable connections. The Determine source and target of the cables via the cable connections project setting must be activated to this purpose. If you use this option, it makes sense to draw the schematic in such a way that cable connections of a cable have the same source and the same target.
If the source and target of the cable are determined page-oriented, the source and target of the cable connections must first be determined page-oriented. To this purpose the Determine the source and target of connections from the placement project setting must be activated additionally.
To determine the source and target of the cable connections manually, use the Source / Target connection property at the connected functions.
Spare cable connections
Spare cable connections (for example, connections included for safety reasons) are automatically placed on the terminals in the terminal strip where the other cable connections are placed. If no terminals are free there, EPLAN shows you a message.
Cable selection
In parts selection you can select a cable part for a cable defined in the schematic. Cable parts are managed in the parts database. Cable information can be either manually entered or imported directly from the manufacturer using various import functions (e.g., ECAD or ECLASS).
During the device selection of a cable, the part connections contained in it are automatically assigned to the individual cable connections. The connection point type is taken into consideration here so that a PE / PEN conductor is automatically connected to a PE / PEN terminal, for example. Manual assignment is another option.
The cable parts used in a project are saved in the project and can be edited further if the project is passed on. This enables you to make new cable selections, for example. Certain properties (e.g., price specifications) can be deleted before a project is passed on.
Inserting cables as a device
If you insert the cable as a device in the graphical editor (by using the Insert center), the individual objects are offered for placing in the order in which they are defined in the parts management. In the process the symbol for the cable definition line or the shield is displayed at the cursor. At the cable connections, the Color / number property of the cable connection is displayed.
If the part disposes of shielded cable connections, the shield is defined together with the corresponding cable connection in a common function template in the parts management. A shield is generated automatically before such a cable connection is inserted.
A connection definition point is generated when a cable connection is placed. If a connection definition point that is not empty already exists for the connection, a query is displayed whether you want to retain the connection definition point or replace it. When replaced, the old connection definition point is deleted and a new one placed with the data from parts management.
Example:The following function templates are defined for a cable part:
|
Line |
Function definition |
Color / no. |
... |
Potential type |
|---|---|---|---|---|
|
1 |
Cable definition |
|||
|
2 |
Conductor / wire |
1 |
Undefined |
|
|
3 |
Conductor / wire |
SH |
SH |
In Row 3 a shielded cable connection is defined and - via the potential type "SH" - at the same time the shield. The shield name is taken from the Color / no. field of this cable connection.
When the device is inserted afterwards in the graphical editor the following objects are offered consecutively:
|
Object |
Display at the cursor |
Properties |
|
|---|---|---|---|
|
1. |
Cable definition |
|
|
|
2. |
Cable connection |
1 |
Color / number: 1, |
|
3. |
Shield |
|
Name of shield: SH |
|
4. |
Cable connection |
SH |
Color / number: SH, |
Standard cable
You can specify a standard cable in the project settings. If one is defined, then the connections will be assigned to the cable connections of the standard cable or to one of the existing cables when you are drawing a cable definition line. Existing connection properties are not changed.
The connections intersected by the cable definition line are searched for a cable DT. There are two possible cases:
- If no cable DT is found, then a new DT is generated and the cable connections of the standard cable are assigned to the connections. This is done based on the identifying properties, which are also taken into consideration in the automatic assignment of suitable cable connections. Only the properties from the function templates are transferred to the connections. The cable does not adopt the part, cable type, or any other unassigned function templates from the standard cable.
- If at least one of the connections intersected by the cable definition line belongs to a cable, then the cable definition line receives the first cable device tag that is found and the free cable connections of the existing cable are assigned to the newly added connections (if possible).
Cable numbering
There are special formatting options for the numbering of cables. This allows you to use (e.g.) the source and target data in the cable DT. Alternatively, cables can also be numbered using the "normal" device numbering function. However, fewer formatting options are available there.
See also
Graphical Display of Cables and Shields