Backward Blocking List
For the objects Conveyor, Track, and TwoLaneTrack the menu command Backward Blocking List opens a table that contains all MUs that wanted to move onto the object at its exit, i.e., were moving in a backward direction from the successor, but could not. When an MU cannot be moved on, Plant Simulation stops it and enters it into the backward blocking list.
The TwoLaneTrack provides a Backward Blocking List for each of its two lanes, i.e., for Lane A and for Lane B.
The table shows the name of the MU (object) and the time at which the MU attempted to leave the succeeding object (time).
When the MU moves backwards, the successor is the object that is connected to the selected object with a Connector and precedes it in the sequence of stations in the simulation model. This approach assumes that normally the flow of materials moves in the forward direction.
If you enter a certain position on the target object using the parameter of data type length, the MU does not enter itself into the Forward/Backward Blocking List as Plant Simulationcannot watch/observe at which point in time this position is available again.
In addition Plant Simulation does not enter an MU into the Forward/Backward Blocking List when it is located on a moving Transporter.
Plant Simulation removes an MU, which is located on the loading space of a Container/Transporter, from the Forward/Backward Blocking List when the Container/Transporter itself is moved.
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