ABB AC 800M, Руководство по стилю объекта библиотеки, Страница: 46 / 120

Grid and Coordinate System Section 4 Engineering Interface
46 3BSE042835-600
Grid and Coordinate System
A basic control module type should typically have four connection nodes and an
internal coordinate system extending from (-1,-1) to (1,1). When working with the
graphics inside control module type, it is advisable to check Show Grid. The default
grid size of 0.02 should normally be used, but other sizes may be used as well.
Do not reshape instances of sub control module types because it will then have
another shape in an operator window than in the main window. Use the Reset Shape
command to ensure that all sub control module instances have their original shape.
Reshaping Issues
Normally, a control module type should not be subject to reshaping. In this case,
make the module square-shaped and place the origin in the center. Place the corners
at integer coordinate points in the internal coordinate system - also when a square
shape is not possible - and use the module all the way out to its limits.
Note that it is possible to put graphical nodes on the clipping border. It is then easy
to combine it graphically with other modules. The reason is that all of its four
corners always will appear on grid points in the external grid. This method is valid
for control module subject to reshaping as well, with the exception that the origin
should be placed in the lower left corner instead. In icons, the lower left corner
should be placed at the origin and the upper right corner at (1,1).
Graphical Connection Nodes
If a control module type has graphical nodes, it is desirable to let its instances
appear on external grid points. Then, it will be easier to obtain good looking
connection schemes.
The origin of the type (in the internal coordinate system) will in the instance always
appear on a grid point of the external coordinate system at creation. Therefore,
nodes that are put on the clipping border where the origin axes cross will always
appear on the grid in the external coordinate system.
Nodes will appear on grid in the external coordinate system if the nodes are at the
origin axes in the internal coordinate system.
If four nodes are not enough, it is advisable to use the corners. All the corners
should be at integer coordinate points.