Signal

A Signal is a named on/off flag the model uses to coordinate itself. It carries no entities and sits to the side of the flow: steps set it and clear it from action logic, and gates watch it to decide when to open. Use a signal to let one part of the model tell another that something has happened.

Naming a signal

Give the signal a name. That name is what you send, clear, and read everywhere else in the model.

How long it stays on

Signal Mode sets how the flag behaves once it is turned on:

• Persistent stays on until something clears it.
• Once turns on and is used up the first time a gate it controls opens, a single pulse.
• Timed turns itself off again after a set duration.

Sending, clearing, and reading

From action logic you turn a signal on with SIGNAL SEND "Go" and off with SIGNAL CLEAR "Go". Anywhere a condition is allowed, you read its state with Signal('Go').Active, which is true while the signal is on. The most common use is a gate whose open condition is Signal('Go').Active, so sending the signal opens the gate and clearing it closes the gate again.