Device SignalBinary

SignalBinary

This page is generated from the Unity twin. Published from _docs/context/devices/signalbinary.md — edit it there, not here. Changes made in the wiki are overwritten on the next sync.

One bit to the PLC that is worked out somewhere else in the twin, rather than measured by a sensor of its own.

Twin device type · twin FB FB_SensorBinary · 4 instances in FG_03, FG_04, FG_05 · Unity component OC.Components.SignalBinary

What it is

It looks like a sensor to the control program — the same single status bit, the same function block — but there is no beam anywhere. It publishes a value another component in the scene computed.

Use it for a verdict rather than an observation: "the press bottomed out with nothing seated under it" is a conclusion drawn from a cylinder position and a sensor together, not something any one sensor can see.

What the PLC sees

Symbol	Meaning
Status.0	The signal is true

How the twin models it

It is pointed at another component in the scene that produces a boolean, and mirrors it. In this machine the source is usually a small project script, such as the one that decides whether the press seated a part.

In this machine

There are 4 of them, in FG_03, FG_04, FG_05:

Device	Twin PLC path	Group	Role / Signal
B_Detect1	MAIN.FG_03.B_Detect1	FG_03	Grip witness for arm 1. Active while gripper 1 actually holds the part.
B_Detect2	MAIN.FG_03.B_Detect2	FG_03	Grip witness for arm 2. Active while gripper 2 actually holds the part.
B_NIO	MAIN.FG_04.B_NIO	FG_04	A VERDICT, not a sensor reading. Active means the press bottomed with nothing correctly seated. Only meaningful at the bottom limit with the hold expired.
B_Detect	MAIN.FG_05.B_Detect	FG_05	Grip witness in the jaws. Active while this unit carries a cap. NOT the same question as B_Part.

Control implementations

The twin is master for structure, and that is all this page states. Which control function block each instance becomes, its process-image members and its published HMI struct is the control platform's own knowledge base:

• Beckhoff
• Siemens — no knowledge base published yet