OR Gate

The OR Gate is an automation building that combines up to two input signals and outputs a Green signal whenever at least one input is Green. If both inputs are Red, the output is Red. It is one of the basic logic gates used to build automation circuits, especially where a system should trigger from either of two conditions.

Its truth table is simple: Red/Red produces Red, while Red/Green, Green/Red, and Green/Green all produce Green. On Automation Ribbon, the OR Gate behaves like a bitwise OR operation, so each channel is processed independently. For example, if one ribbon input is RRGG and the other is RGRG, the output is RGGG.

The OR Gate is useful when a machine should respond to multiple possible triggers without requiring all of them at once. A common use is safety automation, such as turning on a Steam Turbine if a steam room gets too hot even when another connected device, like a Smart Battery, is also sending a Red signal. In this role, it can act as a fallback or override condition in a larger control network.

Like other automation gates, the OR Gate can be placed behind buildings and tiles, and it can occupy the same space as pipes or wires. Its graphic includes a fourth space that does nothing, and Automation Wires can pass through that space freely, just as with the AND Gate and XOR Gate. This makes it easier to route automation cleanly through tight builds.

A few practical points make the OR Gate easier to use effectively:

• It is best for “either/or” conditions, where any one of several inputs should activate the output.
• It can be used to merge safety signals with normal control logic, such as a temperature alarm overriding a power-saving schedule.
• Because it does not require both inputs to be active, it is often simpler than an AND Gate when building redundant or emergency systems.
• Its compact placement behavior lets it fit into crowded industrial setups without blocking pipes or wires.

As with the rest of the automation system, the OR Gate is a small building with a large impact: it makes complex control schemes easier to assemble, and it helps keep power, heat, and machine behavior under precise control.