# 7.41. Toggle

This section is referenced in the following other sections

- Simulation Setup: Feature Toggling

## 7.41.1. Toggle Block

Scope

  Sierra

Summary

  This command block defines the period(s), state and initial conditions for model feature toggling.

Description

  Defines a generic entity toggling specification and associate it with name ModelName. The same ModelName can be used for various model features such as element blocks, boundary conditions, contact and volumetric sources.

    begin Toggle Block ModelName

       Freeze Element Block Solution State

       Period {=} Period_list...

       State {=} {active | inactive}

    end Toggle Block ModelName

### 7.41.1.1. Line Commands

###### Freeze Element Block Solution State

Syntax

  Freeze Element Block Solution State

Summary

  Specify that the solution state remain the same when an element block has been toggled on.

Description

  Specifies that the initial condition is not reset on any associated element block that has been toggled. The default behavior is to have the initial conditions reset on element blocks that have been toggled back on.

###### Period

Syntax

  Period {=} Period_list…

Summary

  Specify the periods over which this toggling model is to be used.

Description

  Defines the time periods over which this toggling model is to be used. Note that more than one PERIOD can be appear in the command block.

Parameter | Value | Default
--- | --- | ---
{=} | {= | are | is} | –
Period_list | string… | –

###### State

Syntax

  State {=} {active | inactive}

Summary

  Specify the state for this toggling model over the periods it is to be used.

Description

  Defines the toggle state for the time periods over which this toggling model is to be used. Note that more than one STATE can be appear in the command block.

Parameter | Value | Default
--- | --- | ---
{=} | {= | are | is} | –
ToggleState | {active | inactive} | –

## 7.41.2. Use Toggle Block

Syntax

  Use Toggle Block ToggleName [ {on} ElementBlockList… ]

Summary

  Specification for toggling entities in the computational model based on Toggle Block parameters. When used at the region level, the list of element blocks to be toggled must be provided. Otherwise a listing of entities is not needed as the Toggle Block will be associated with the command line or the enclosing command block.

Parameter | Value | Default
--- | --- | ---
ToggleName | string | –