Tuesday, October 10, 2017

Conveyors Control System For Bulk Materials (RSLogix 5.0)

Back to power plant (CFSPP), Control System of Conveyor for Bulk Materials (coal), takes a half of month to refresh about Ladder and Arena.

The conveyor velocity, cell size, and segment lengths in the Segment module use a common length (meter).

For a nonaccumulating conveyor, when the conveyor stops (to load or unload an entity), all entities on the conveyor stop as well. The original spacing between entities on the conveyor is constant.

When using an accumulating conveyor, the conveyor does not physically stop when an entity is loading or unloading. A local blockage occurs and entities continue to convey until they reach the blockage. At this time, the Accumulation Size is evaluated.

Entities may access one or more cells of a conveyor.

The sum of the distances among the stations on the conveyor (specified by Segment module) must be divisible by the cell size. If not, an error will occur when the model is checked.

During accumulation, the entity will accumulate based on the Accumulation Size specified. This size may be different from the number of cells that the entity originally accessed. If so, the entity will return to its original size when the blockage is cleared and the accumulation dissipates. This size does not have to be divisible into an even number of cells.

The velocity of the conveyor may be changed by using the variable VC(Conveyor).

There are many conveyor status variables, both for accumulating and non-accumulating conveyors. Several common variables are LEC(Conveyor) and NEC(Conveyor) to evaluate the length and number of entities conveying on the conveyor, respectively. Additional accumulating conveyor variables are CLA(Conveyor) to evaluate the length of accumulated entities and NEA(Conveyor) to evaluate the number of accumulated entities.