Device DriveSimple

DriveSimple

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

A conveyor motor: run forwards, run backwards, or stop. Reports the speed it actually reached and whether it is moving.

Twin device type · twin FB FB_Drive · 4 instances in FG_Transport · Unity component OC.Components.DriveSimple

What it is

The motors that move pallets: the conveyor belts on both levels, and the short belt on each lift carriage. Not a positioning axis — it has no target position and no idea where anything is. It runs until it is told to stop, and something else, usually a sensor, decides when that is.

What the PLC sees

Symbol	Meaning
Control.0	Run forwards
Control.1	Run backwards
Status.6	Moving
StatusData	Actual speed

Setting both direction bits, or neither, commands a stop.

How the twin models it

The speed ramps towards the commanded direction at a configured acceleration rather than jumping to it, and the resulting speed drives everything standing on the belt. Each instance has its own speed and acceleration.

Watch out

A running belt is not a moving pallet. The motor reports its own speed, and nothing else. Whether a pallet actually arrived is a sensor's answer — which is exactly the mistake a twin is there to catch.

In this machine

Signal — Simple drive: forward and backward run bits out, one drive-active bit back. No speed reference and no encoder.

There are 4 of them, in FG_Transport:

Device	Twin PLC path	Group
M_Conveyor	MAIN.FG_Transport.Lift01_M_Conveyor	FG_Transport
M_Conveyor	MAIN.FG_Transport.Lift02_M_Conveyor	FG_Transport
M_Conveyor	MAIN.FG_Transport.Transport01_M_Conveyor	FG_Transport
M_Conveyor	MAIN.FG_Transport.Transport02_M_Conveyor	FG_Transport

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