Logic relay

logic_relay
Type	Point entity
Engine	Source
Availability	In all games

is a message forwarder. It can be used to fire many outputs at once from just one input, or, by being disabled, to break an I/O chain. It can also be very helpful for organization and keeping you from having to edit MANY instances of the same outputs, as opposed to just one.

After a logic_relay is triggered, it cannot be triggered again until all of its outputs are fired. This is useful for when a relay has a sequence of delayed outputs that shouldn't be repeated until the sequence is finished. This behavior can be disabled with the "Allow fast retrigger" spawnflag.

Class hierarchy
CLogicRelay ↳CLogicalEntity ↳CServerOnlyEntity ↳CBaseEntity
logicrelay.cpp

Keyvalues

Name (targetname) <string>[ Edit ]

The name that other entities refer to this entity by, via Inputs/Outputs or other keyvalues (e.g. parentname or target).
Also displayed in Hammer's 2D views and Entity Report.

See also:  Generic Keyvalues, Inputs and Outputs available to all entities

Start Disabled (StartDisabled) <boolean>

Stay dormant until activated (with theEnableinput).

Flags

[ 1 ] : Only trigger once

[ 2 ] : Allow fast retrigger

Inputs

Enable

Allows the relay to fire the OnTrigger outputs after being disabled.

Disable

Prevents the relay from firing OnTrigger outputs in response to Trigger inputs.

Trigger

Trigger the relay, causing its OnTrigger output to fire if it is enabled.

Toggle

Toggle the relay between enabled and disabled.

CancelPending

Cancel any events fired by this relay that are currently pending in the I/O event queue.

EnableRefire  !FGD

Automatically fired on a relay after any delayed outputs finish firing, allowing it to fire again.

TriggerWithParameter <stringRedirectInput/string> (only in )

Triggers the relay with a parameter, causing its OnTriggerParameter output to fire if it is enabled.

Outputs

OnSpawn

Fired when the relay is spawned. If the relay is set to only trigger once, it will delete itself after firing this output.

Note:Every level load (including save loads!) triggers this output, unless "Fire once only" is checked.

OnTrigger

Fired when the relay is triggered. If the relay is set to only trigger once, it will delete itself after firing this output.

OnTriggerParameter <stringRedirectInput/string> (only in )

Fired when the relay is triggered with a parameter. If the relay is set to only trigger once, it will delete itself after firing this output.