Product description
Operating Instructions
Chapter
3
9
8014012/1EF3/2021-12-08
Subject to change without notice
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A3M60 Basic
3
Product description
This chapter provides information on the special features and properties of the A3M60
Basic PROFIBUS Absolute Encoder. It describes the construction and the operating
principle of the device.
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Please read this chapter before mounting, installing and commissioning the device.
3.1
Special features
The A3M60 Basic is a PROFIBUS Absolute Encoder in 60 mm design. The highest reliability
is achieved by means of electro-sensitive, magnetic scanning. The high resolution Hall
sensor combines a magnetic sensor with the high resolution that otherwise only optical
sensors achieve.
Due to direct multiturn technology with a small number of moving parts, long and trouble-
free operation is ensured.
The following properties characterize the A3M60 Basic:
communication modules for position value and preset or position value, time stamp,
speed and preset
output of the position value with a resolution of 26 bits
total resolution (measuring range) maximum 67,108,864 steps
resolution per revolution maximum 8,192 steps
total resolution and resolution per turn can be scaled
PROFIBUS DP interface
The encoder is a slave with cyclic data transmission (DP<V0).
3.2
Operating principle of the encoder
The sensor system in the A3M60 Basic PROFIBUS Absolute Encoder is based on absolute
acquisition of revolutions without an external supply and without a battery.
The A3M60 Basic acquires the position of rotating axes and outputs the position in the
form of a unique digital numeric value. The A3M60 Basic can be used as a singleturn
encoder or multiturn encoder.
Singleturn technology with Hall sensor
Singleturn encoders are used if absolute acquisition of the rotation of a shaft is required.
A high resolution Hall sensor supplies analog data to the microcontroller for the calculation
of the absolute position within a revolution.
Multiturn technology with the aid of Wiegand wire technology
Multiturn encoders are used if more than one shaft revolution must be acquired
absolutely.
A magnet is mechanically attached to the encoder shaft.
The rotating magnet generates a step change in the magnetic field in the Wiegand wire.
This step change in the magnetic field generates a voltage pulse in the surrounding coil.
The voltage pulse supplies a FRAM counter with energy.
The turns are counted.
