Outline Of Positioning Control - Mitsubishi Electric FATEC MELSEC iQ-R Training Manual

Chapter 1

Outline of Positioning Control

1.1 Outline of Positioning Control
The term "positioning" refers to the process to move a body, such as a workpiece or a tool,
(hereinafter, collectively referred to as a workpiece) at the specified speed and stop the body
accurately at the target position.
The movement control of workpiece to the target position can be easily made by stopping
the workpiece using a timer or installing a sensor at the stop position. However, various
problems may arise if it is required to stop it accurately at the position or after moving at a
high speed.
Manual
control
Automatic
control
To solve these problems, the positioning procedures are described below, so that you can
learn how to transfer a workpiece to the target position at a high speed and stop the
workpiece correctly.
Positioning
ON
If stopped with
the pushbutton
OFF
Start position
Varies depending
on conveyor speed.
Stop after 10 seconds!
Start position
High speed
Target stop position
Target stop position
Stop with this sensor!
Target stop position
Precisely
1-1
Varies in
each case.
Varies if the
speed is low.