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bk1 has embedded sensors.

A block with embedded sensors saves space in the track plan, and can speed up creating a new track plan.
After dropping this type of block the following actions will be automatically handled by the server:

1. Generate two new invisible sensor objects with IDs fitting to the block: "blockID+" and "blockID-".
   In the example above: left Block side = "bk1+" and right Block side = "bk1-"
2. Generate the four route events for both sides of the block; Enter and In.

Setting the sensor addresses must be done manually.

See also: Changing IDs

The block with embedded sensors is found in the block section of the Track picker dialog:

The sensors can be simulated like the separate sensors with the Left Mouse button.
The sensor which will be activated depends of the mouse position in the respective quarter of the Block symbol.

As described in the introduction, if this type of block is created, the embedded sensors get the Block ID plus the sign of the blockside.

Attention:
This relation of the IDs is absolute required for the function of a "block with embedded sensors".
Therefore, changes to IDs within this type of block must be carried out synchronously.
If a block ID later will be changed, the IDs of both sensors must also be changed accordingly.
Example: Block = "Block1"; Sensor at plus side = "Block1+"; Sensor at minus side = "Block1-".
If necessary the IDs of these objects must also be adapted in actions or scripts.