For particular graphical arrangements, EPLAN automatically recognizes which PLC supply connection points belong to an I/O connection point. The search occurs on both schematic pages and overview pages.
Search for the channel membership on schematic pages
On schematic pages, the search begins at a power supply connection point and proceeds upwards. The search then proceeds in a counter-clockwise direction at the same distance ("every 15 minutes"). The distance is always increased upwards ("at every full hour").
The search ends when an I/O connection point is found. The power supply connection point then belongs to the same channel as the found I/O connection point.
Example:
In this example, connection point "1" belongs to power supply connection point "V".
If the search encounters a power supply connection point, then EPLAN assumes that this belongs to the same channel. The search then continues in the same direction ( i.e., no longer in a circle) until the same distance from this new supply connection point is reached, as when the search began. From there, the search continues in a circle around both connection points.
In this example, the power supply connection point "V2" belongs to connection point "14", and the power supply connection point "V1" belongs to connection point "2".
If the search again encounters a power supply connection point, it then proceeds in a straight line (until the same distance as to the first connection point is reached) and then again in a circle.
In this example, the power supply connection point "V2" belongs to connection point "14", the power supply connection point "V1" belongs to connection point "2" and the power supply connection point "V3" also belongs to connection point"14".
Search for the channel membership on PLC overview pages
The search for related connection points on overview pages follows the same principle as with schematic pages. There is however a difference:
On overview pages, the search proceeds downwards and the distance is increased downwards each time.
An error message is not generated when no channel is found for a power supply connection point since this may be intentional.
See also