Seizes the crane and sends it to the specified location. The agent enters the SeizeCrane block and is placed in the queue of the crane specified in the block’s properties where it waits until the crane arrives at the destination. When the crane reaches the specified destination, the agent leaves the block.

You can use this block to model complex crane logic, where you need to separate the crane’s movement to the agent from the transportation of the agent by the crane: for example, if you want to insert some processing of the agent (material item) between these two processes. The additional handling of the agent can be modeled using blocks from the Process Modeling library.

Use the ReleaseCrane block or the MoveByCrane block to release the seized crane.

Demo model: SeizeCrane and ReleaseCrane Open the model page in AnyLogic Cloud. There you can run the model or download it (by clicking Model source files). Demo model: SeizeCrane and ReleaseCraneOpen the model in your AnyLogic desktop installation.

You can select either an entire crane or a specific bridge.

• If the selected bridge is seized by another agent, the new agent will be placed in the queue of that bridge.
• If you select a multibridge crane, the agent will seize the closest available bridge that is physically able to pick up that agent and deliver it to the destination point.
• If all bridges are seized, the agent will wait in the crane’s queue until one of the bridges is released and then will check if that bridge can deliver it to the destination point.
• If more than one bridge is released at the same time, the agent will choose the closest bridge that can deliver it to the destination point.

Crane

The crane or bridge that moves the agent (material item).

Type: Crane
Local variable: T agent — the current agent (material item)

Destination is

Defines where the crane will be sent. Possible destinations are:

Agent — the current agent location
Node — the specified network node
Attractor — the specified attractor
Conveyor — the specified conveyor
Position on conveyor — the specified position on conveyor
(x, y, z) — the point with the specified coordinates

Name: destinationType
Type: SeizeCrane.DestinationType
Valid values:
SeizeCrane.DEST_AGENT — Agent
SeizeCrane.DEST_NODE — Node
SeizeCrane.DEST_ATTRACTOR — Attractor
SeizeCrane.DEST_CONVEYOR — Conveyor
SeizeCrane.DEST_POSITION_ON_CONVEYOR — Position on conveyor
SeizeCrane.DEST_XYZ — (x, y, z)

Node

[Visible and applies only if Destination is: Node]
The network node where the crane or bridge will be sent.

Type: Node
Local variable: T agent — the current agent

Attractor

[Visible and applies only if Destination is: Attractor]
The attractor where the crane or bridge will be sent.

Type: Attractor
Local variable: T agent — the current agent (material item)

Conveyor

[Visible and applies only if Destination is: Conveyor]
The conveyor where the crane or bridge will be sent.

Type: ConveyorPath
Local variable: T agent — the current agent (material item)

Offset from

[Visible and applies only if Destination is: Conveyor]
Defines how to calculate the offset of the exact point on a conveyor where the crane or bridge will be sent: from the beginning of the conveyor, or from the end of the conveyor.

Type: boolean
Default value: true — The beginning of the conveyor
Local variable: T agent — the current agent (material item)

Offset

[Visible and applies only if Destination is: Conveyor]
The distance from the starting or ending point of the conveyor (depends on the Offset from parameter) that defines the exact destination point for the crane.

Type: double
Local variable: T agent — the current agent (material item)

Position on conveyor

[Visible and applies only if Destination is: Position on conveyor]
The position on conveyor where the crane or bridge will be sent.

Type: PositionOnConveyor
Local variable: T agent — the current agent (material item)

X, Y, Z

[Visible and applies only if Destination is: (x, y, z)]
X, Y, Z coordinate of the point where the crane or bridge will move to.

Type: double
Local variable: T agent — the current agent (material item)

Use operation time

If this option is selected (true), you can directly specify the time it takes the crane to reach the agent (material item). Speed values will be recalculated for every agent to satisfy operation time.

Name: useOperationTime
Type: boolean

Operation time

[Visible and applies only if Use operation time option is selected]
The amount of time provided to the crane to transport the agent. The value is evaluated for every agent after On at enter action is executed.

Type: double
Default value: 1 minute
Local variable: T agent — the current agent (material item)

Priority

Defines the expression that the crane or bridge evaluates to select an agent to serve. The expression must return an integer. The crane or bridge will serve the agents for which the expression returns the larger value first.
The simplest way to use this is to create an integer parameter for the agent type that the crane or bridge should serve, and then specify it as Priority. For example, if your agent type has the priority parameter, which represents the priority of the individual material item, the value of this property can be set to agent.priority.
If set to the default value of 0, or if multiple agents have the same priority, the agents are served according to the FIFO (first in, first out) policy.

Type: double
Default value: 0
Local variable: T agent — the current agent (material item)

Safe height

Specifies the minimum height the crane should raise the agent to in order to transport it (e.g., to avoid obstacles). It is calculated as distance between the hook and the crane's Z coordinate.

Type: double
Default value: 1 meter
Local variables:
Crane crane — the crane
T agent — the agent (material item)

Actions

On enter

Here you can type Java code that will be executed when the agent (material item) enters the block.

Local variable: T agent — the current agent (material item)

On exit

Here you can type Java code that will be executed when the agent (material item) leaves the block.

Local variable: T agent — the current agent (material item)

On remove

Here you can type Java code that will be executed when the agent (material item) is removed from this block.

Local variable: T agent — the current agent (material item)

On seize crane

Here you can type Java code that will be executed when the agent (material item) seizes the crane.

Local variables:
T agent — the current agent (material item)
Crane crane — the crane

Function	Description
boolean contains(Agent agent)	Returns true if this block contains the specified agent. agent — The agent (material item).
int size()	Returns the number of agents that are currently inside this block.
T get(int index)	Returns the agent with the specified index. The order of the agents corresponds to the order in which they are picked up by the block. index — The index of the agent.
T remove(Agent agent)	Removes the specified agent from the block. If the agent is still in the queue, it is removed from both the queue and the block. If the crane is already moving to the agent, then when the function is called, the crane is released and the agent is removed from the block, with the crane stopping. agent — The agent (material item).

in

The input port.

out

The output port.

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