Machine FG_04

FG_04

This page is generated from the Unity twin. Published from _docs/context/fg-04.md — edit it there, not here. Changes made in the wiki are overwritten on the next sync.

Scene path	Project/FG_04
Twin PLC path	MAIN.FG_04
Served by	Index04 (FG_Transport)
Symbols	2
Behaviour	fg-04-behaviour.md

Presses the part home into its slot and checks that it seated correctly.

Figure

The FG_04 press station, isolated.

Devices

#	Device	Type	Twin FB	Twin PLC path	What it does
1	Y_AxisZ	Cylinder	FB_Cylinder	MAIN.FG_04.Y_AxisZ	Press cylinder. Strokes down to seat the part in its slot, holds 1 s, then retracts.
2	B_NIO	SignalBinary	FB_SensorBinary	MAIN.FG_04.B_NIO	Not in order signal for the press. PartPressDetector raises it when the press cylinder has reached its bottom limit but the seating sensor sees no part - press completed with nothing correctly seated.

# is the numbered arrow on the figure above.

The twin path is not the control path. A control platform spells these devices differently - it may fold a twin child into its parent unit, or address it from another root entirely - and only the control spelling works in a binding or a link, where the twin's fails silently. The verified control path for each row is on the vendor page linked below.

Bit mapping

None.

Hierarchy

The scene tree. The comment on each line is what the node is; † marks one that differs between scenes.

Y_AxisZ:   # Cylinder
Axis_Z:    # grouping, not a device
B_NIO:     # SignalBinary
  Sensor:  # SensorBinary · simulation only, no PLC

Unity

Twin animation: SequenceUnit4.cs — behaviour contract is in transport-behaviour.md

Simulation only - they talk to no PLC at all:

• Sensor (SensorBinary)

Notes

Y_AxisZ — MAIN.FG_04.Y_AxisZ · Cylinder

• Signal — Double solenoid with both limits read. EXTENDED presses down onto the part; retracted is clear. A double solenoid so an abort leaves it where it is.

Axis_Z — `` · not a PLC symbol

• Function — Kinematic axis carrying the press head down onto the part and back up.
• Twin — OC Axis driven by the Y_AxisZ cylinder. The seating verdict does not come from here - PartPressDetector raises B_NIO.

B_NIO — MAIN.FG_04.B_NIO · SignalBinary

• Signal — 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.

Sensor — MAIN.FG_04.Sensor · SensorBinary · not a PLC symbol

• Function — Seating sensor under the press. Detects that a part is present and correctly seated.
• Signal — Not a PLC symbol - its Link is disabled. It feeds PartPressDetector locally, which publishes the result to the PLC as B_NIO.

Control implementations

The twin is master for structure, and that is all this page states. The control module, the twin device layer, the verified control PLC paths and the terminal mapping is the control platform's own knowledge base:

• Beckhoff
• Siemens — no knowledge base published yet