Entity Store

Store entities

• 

Libraries:
SimEvents

Description

The Entity Store block serves as a container or bin to store unordered entities. The entities are ready to leave the block immediately provided they are accepted by the next block. The Entity Store block attempts to forward an entity immediately upon its arrival. If the attempt fails, the block puts the entity in a pending state. The entity can then leave when the next block can start accepting it.

To customize actions when entities enter, exit, or are blocked, enter MATLAB^® code in the Entry action, Exit action, or Blocked action field of the Event actions tab.

Examples

Match Entities Based on Attributes

Build a model to store and match entities representing bicycle components. The model uses an Entity Store block for storage and an Entity Selector block to match a set of bicycle wheels to the corresponding size frame for assembly.

Open Model

Inventory Management

Build a simple inventory management system for a retail store. This example includes:

Open Model

Job Scheduling and Resource Estimation for a Manufacturing Plant

Model a manufacturing plant. The plant consists of an assembly line that processes jobs based on a pre-determined schedule. This example walks you through a workflow for:

Open Script

Ports

Input

Port_1 — Input entity

scalar | vector | matrix

Input entity port for entities entering the storage.

Data Types: single | double | int8 | int16 | int32 | int64 | uint8 | uint16 | uint32 | uint64 | Boolean | enumerated | bus | fixed point

Output

Port_1 — Output entity

scalar | vector | matrix

Output entity port for entities exiting the storage.

Data Types: single | double | int8 | int16 | int32 | int64 | uint8 | uint16 | uint32 | uint64 | Boolean | enumerated | bus | fixed point

Port_d — Number of entities that have departed the block

scalar

Number of entities that have departed the block.

Dependencies

To enable this port, click the Statistics tab and select the box labeled Number of entities departed, d.

Data Types: double

Port_n — Number of entities that have not yet departed the block

scalar

Number of entities that have not yet departed the block.

Dependencies

To enable this port, click the Statistics tab and select the box labeled Number of entities in block, n.

Data Types: double

Port_w — Average wait time for entities in the block

scalar

Average wait time for entities in the block.

Dependencies

To enable this port, click the Statistics tab and select the box labeled Average wait, w.

Data Types: double

Port_l — Average store size

scalar

Average size of the store.

Dependencies

To enable this port, click the Statistics tab and select the box labeled Average store size, l.

Data Types: double

Port_ex — Number of entities extracted

scalar

Number of entities that are pulled out of this block.

Dependencies

To enable this port, click the Statistics tab and select the box labeled Number of entities extracted, ex.

Data Types: double

Parameters

Capacity — Specify the capacity of the storage

25 (default) | scalar

Specify the maximum number of entities contained in the storage.

Programmatic Use

Block Parameter: Capacity

Type: character vector

Values: '25' | scalar

Default: '25'

Number of entities departed, d — Outputs the number of entities that have departed the block

off (default) | on

Selecting this check box outputs the number of entities that have exited the block.

Programmatic Use

Block Parameter: NumberEntitiesDeparted

Type: character vector

Values: 'on' | 'off'

Default: 'off'

Number of entities in block, n — Outputs the number of entities present in the block, which have yet to depart

off (default) | on

Selecting this check box outputs the number of entities present in the block, which have yet to depart.

Programmatic Use

Block Parameter: NumberEntitiesInBlock

Type: character vector

Values: 'on' | 'off'

Default: 'off'

Average wait, w — Outputs the average wait time

off (default) | on

Sum of the wait times for entities departing the block divided by their total number. Wait time is the duration between the Entity Store block entry and exit of an entity. For more information, see Interpret SimEvents Models Using Statistical Analysis.

Programmatic Use

Block Parameter: AverageWait

Type: character vector

Values: 'on' | 'off'

Default: 'off'

Average store size, l — Outputs the average store size

off (default) | on

Accumulated time-weighted average store size. Store size is the number of entities stored in the block. The block computes average store size by:

1. Multiplying the store size by its duration to calculate time-weighted store size

2. Summing up all time-weighted store sizes and averaging them over total time

For more information, see Interpret SimEvents Models Using Statistical Analysis.

Programmatic Use

Block Parameter: AverageStoreSize

Type: character vector

Values: 'on' | 'off'

Default: 'off'

Number of entities extracted, ex — Number of entities extracted from this block

off (default) | on

Outputs the number of extracted entities which are pulled out from this block by the Entity Find block. When an entity is extracted, Number of entities departed, d, Number of entities in block, n, Average wait, w, and Average store size, l statistics are updated accordingly. For more information about finding and extracting entities, see Find and Extract Entities in SimEvents Models.

Programmatic Use

Block Parameter: NumEntitiesExtracted

Type: character vector

Values: 'on' | 'off'

Default: 'off'

Version History

Introduced in R2018a